Remove Cython as a build dependency (#7777)

This follows up on #7702, which removed the last of the Cython code. The current change was was presumably intended to be part of that PR, I think, based on the release note added there: > Cython is no longer a build dependency of Qiskit Terra and is no > longer required to be installed when building Qiskit Terra from > source.
Qiskit · Mar 14, 2022 · a7d66f9 · a7d66f9
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commit a7d66f9
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diff --git a/pyproject.toml b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["Cython>=0.27.1", "setuptools", "wheel", "setuptools-rust"]
+requires = ["setuptools", "wheel", "setuptools-rust"]
 build-backend = "setuptools.build_meta"
 
 [tool.black]

diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -14,7 +14,6 @@ pylint==2.8.3
 stestr>=2.0.0
 PyGithub
 wheel
-cython>=0.27.1
 pylatexenc>=1.4
 ddt>=1.2.0,!=1.4.0,!=1.4.3
 seaborn>=0.9.0