Bump blockdiag from 2.0.1 to 3.0.0 (#8761)

Bumps [blockdiag](https://github.com/blockdiag/blockdiag) from 2.0.1 to
3.0.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/blockdiag/blockdiag/blob/master/CHANGES.rst">blockdiag's
changelog</a>.</em></p>
<blockquote>
<h2>3.0.0 (2021-12-06)</h2>
<ul>
<li>
<p>Drop python3.6 support</p>
</li>
<li>
<p>Use funcparserlib-1.0.0a0 or newer to support new python versions</p>
</li>
<li>
<p>Allow to write multiline string via triple quotes (&quot;&quot;&quot;
... &quot;&quot;&quot;)</p>
</li>
<li>
<p>Fix a bug</p>
<ul>
<li>Fix <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/147">#147</a>:
file existence disclosure using svg renderer</li>
</ul>
</li>
</ul>
<h2>2.0.0 (2020-02-01)</h2>
<ul>
<li>
<p>Fix a bug</p>
<ul>
<li>Fix <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/126">#126</a>:
'_io.BufferedRandom' object has no attribute 'buffer'</li>
</ul>
</li>
</ul>
<h2>2.0.0 (2020-01-26)</h2>
<ul>
<li>
<p>Drop python2 and python3.4 support</p>
</li>
<li>
<p>Fix a bug</p>
<ul>
<li>Fix <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/109">#109</a>
blockdiag does not work with recent pillow</li>
</ul>
</li>
</ul>
<h2>1.5.4 (2018-07-22)</h2>
<ul>
<li>
<p>Fix bug</p>
<ul>
<li>Fix <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/94">#94</a>
Python 3.7 compatibility</li>
</ul>
</li>
</ul>
<h2>1.5.3 (2015-07-30)</h2>
<ul>
<li>
<p>Fix bug</p>
<ul>
<li>Fix <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/67">#67</a>
Group overlaps with nodes having href</li>
</ul>
</li>
</ul>
<h2>1.5.2 (2015-05-17)</h2>
<ul>
<li>
<p>Fix dependency; webcolors-1.5 does not support py32</p>
</li>
<li>
<p>Fix bug</p>
<ul>
<li>Fix images.open() failed with PIL</li>
</ul>
</li>
</ul>
<h2>1.5.1 (2015-02-21)</h2>
<ul>
<li>
<p>Fix bug</p>
<ul>
<li>Fix labels are overwrapped on antialias mode</li>
</ul>
</li>
</ul>
<h2>1.5.0 (2015-01-01)</h2>
<ul>
<li>Refactor cleanup procedures</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/ce37f0c18dc7f88caab3d3b24aac4f3f066b793c"><code>ce37f0c</code></a>
Bump version</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/030da560763a4d0bec313552ecb2ba8cbd98dfc5"><code>030da56</code></a>
Merge pull request <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/158">#158</a>
from Mogztter/patch-1</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/8d48c48d365d0c2a45ab6671c9307b8cbcae8af8"><code>8d48c48</code></a>
Update badges</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/52b3023a212de232d30d2685e24fe570b2677c31"><code>52b3023</code></a>
Merge pull request <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/157">#157</a>
from blockdiag/link_action</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/5e6a686209bfd1373d4c0061f7737bf7ee8418a0"><code>5e6a686</code></a>
test: Add flake8 target to tox.ini</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/fdfde71eeb913bce207d6f17d41675e3d4c5db90"><code>fdfde71</code></a>
test: Do linting on custom action</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/93b542090acf9cde1aa3726fdf1824a9e412f568"><code>93b5420</code></a>
Merge pull request <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/156">#156</a>
from blockdiag/adjust_gha</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/4e9a67f3f39d05f50b88344d8f8203524bcb7c90"><code>4e9a67f</code></a>
Adjust GitHub Actions</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/7392df8a45b34bc7766e2b470bc26673c924f96c"><code>7392df8</code></a>
Merge pull request <a
href="https://redirect.github.com/blockdiag/blockdiag/issues/155">#155</a>
from blockdiag/fix_readme</li>
<li><a
href="https://github.com/blockdiag/blockdiag/commit/c23489868beda05e420f687b6cbe4b401aa30c9e"><code>c234898</code></a>
Fix README; python 3.7 or later</li>
<li>Additional commits viewable in <a
href="https://github.com/blockdiag/blockdiag/compare/2.0.1...3.0.0">compare
view</a></li>
</ul>
</details>
<br />


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requirements/constraints.txt

@@ -30,7 +30,7 @@ babel==2.9.1
     # via sphinx
 backports-entry-points-selectable==1.3.0
     # via virtualenv
-blockdiag==2.0.1
+blockdiag==3.0.0
     # via sphinxcontrib-blockdiag
 brotli==1.1.0 ; platform_python_implementation == "CPython"
     # via -r requirements/runtime-deps.in

requirements/doc-spelling.txt

@@ -95,6 +95,4 @@ zipp==3.17.0
 
 # The following packages are considered to be unsafe in a requirements file:
 setuptools==68.0.0
-    # via
-    #   blockdiag
-    #   sphinx
+    # via blockdiag

requirements/doc.txt

@@ -90,6 +90,4 @@ zipp==3.17.0
 
 # The following packages are considered to be unsafe in a requirements file:
 setuptools==68.0.0
-    # via
-    #   blockdiag
-    #   sphinx
+    # via blockdiag