[3.6] Bump sphinxcontrib-blockdiag from 1.5.5 to 2.0.0 (#4428)

[TBBle]

(cherry picked from commit bbea369)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Needed to fix CI builds for this branch due to transitive dependency drift, see #4570 (comment)

[asvetlov]

Codecov Report

Merging #4576 into 3.6 will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              3.6    #4576      +/-   ##
==========================================
- Coverage   97.96%   97.88%   -0.08%     
==========================================
  Files          44       44              
  Lines        8886     8886              
  Branches     1392     1392              
==========================================
- Hits         8705     8698       -7     
- Misses         72       75       +3     
- Partials      109      113       +4     

Impacted Files	Coverage Δ
aiohttp/pytest_plugin.py	95.51% <0.00%> (-1.93%)	⬇️
aiohttp/helpers.py	95.27% <0.00%> (-1.25%)	⬇️
aiohttp/web_fileresponse.py	98.29% <0.00%> (+0.56%)	⬆️

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[codecov-io]

Codecov Report

Merging #4576 into 3.6 will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              3.6    #4576      +/-   ##
==========================================
- Coverage   97.96%   97.92%   -0.04%     
==========================================
  Files          44       44              
  Lines        8886     8886              
  Branches     1392     1392              
==========================================
- Hits         8705     8702       -3     
- Misses         72       74       +2     
- Partials      109      110       +1

Impacted Files	Coverage Δ
aiohttp/pytest_plugin.py	95.51% <0%> (-1.93%)	⬇️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[TBBle]

The Codecov decreases are all around code for Python 3.7. I'm pretty sure that's because the Python 3.7 CI tests all failed due to something about brotlipy, e.g., https://dev.azure.com/aio-libs/aiohttp/_build/results?buildId=2400&view=logs&jobId=0e1435bb-9b02-56e8-f42e-850ecf5364f5&j=0e1435bb-9b02-56e8-f42e-850ecf5364f5&t=04072f5d-ea3c-53d7-c4d2-75ecd591d50d.

This might be another transitive bit-rot issue, since this branch hasn't passed CI since October 2019, and the logs for those CI runs have expired.

Perhaps backporting #3803 would help, but that hasn't been done for 3.7 either, so it's probably not the right action.

Perhaps the Python 3.7 platform doesn't have wheel installed, and we've been lucky before now? https://dev.azure.com/aio-libs/aiohttp/_build/results?buildId=2400&view=logs&j=0e1435bb-9b02-56e8-f42e-850ecf5364f5&t=04072f5d-ea3c-53d7-c4d2-75ecd591d50d&l=56 suggests that installing wheel in the same run doesn't make it available to later packages.

[TBBle]

Okay, now the Python 3.7 tests are failing, which is progress.

================================== FAILURES ===================================
____________________ test_proxy_https_bad_response[pyloop] ____________________

proxy_test_server = <function proxy_test_server.<locals>.proxy_server at 0x0000027C16760A68>
get_request = <function get_request.<locals>._request at 0x0000027C16ACEB88>

    async def test_proxy_https_bad_response(proxy_test_server,
                                            get_request) -> None:
        url = 'https://secure.aiohttp.io/path'
        proxy = await proxy_test_server()
        proxy.return_value = dict(
            status=502,
            headers={'Proxy-Agent': 'TestProxy'})
    
        with pytest.raises(aiohttp.ClientHttpProxyError):
            await get_request(url=url, proxy=proxy.url)
    
        assert len(proxy.requests_list) == 1
        assert proxy.request.method == 'CONNECT'
>       assert proxy.request.path == 'secure.aiohttp.io:443'
E       AssertionError: assert '443' == 'secure.aiohttp.io:443'
E         - 443
E         + secure.aiohttp.io:443

tests\test_proxy_functional.py:346: AssertionError

[TBBle]

The failing test was disabled on master in 2ef9911, with the same failure on MacOS that I'm now seeing on all the Python 3.7 builds. So cherry-picking that commit too.

[TBBle]

@asvetlov: Ping? I don't know why code-cov claims a fall in coverage, it suggests the various proactor_loop tests are not being run on Windows with Python 3.7, but the logs show at least one passing.