No longer installed pylint/astroid on Python 2.7

Signed-off-by: Andreas Maier <andreas.r.maier@gmx.de>

dev-requirements.txt

@@ -78,19 +78,15 @@ Babel>=2.7.0
 # Pylint 2.0 / astroid 2.0 removed py27, added py37
 # Pylint 2.7 / astroid 2.5 removed support for py35
 # Pylint 2.7-2.9 had issue https://github.com/PyCQA/pylint/issues/4118 (issues #2672, #2673)
-pylint>=1.6.4,<2.0.0; python_version == '2.7'
 pylint>=2.5.2; python_version == '3.5'
 pylint>=2.10.0; python_version >= '3.6'
-astroid>=1.4.9,<2.0.0; python_version == '2.7'
 astroid>=2.4.0; python_version == '3.5'
 astroid>=2.7.2; python_version >= '3.6'
 typed-ast>=1.4.0,<1.5.0; python_version >= '3.6' and python_version < '3.8' and implementation_name=='cpython'
 # lazy-object-proxy is used by astroid
-lazy-object-proxy>=1.4.3; python_version == '2.7'
 lazy-object-proxy>=1.4.3; python_version >= '3.5'
 # wrapt 1.13.0 started depending on MS Visual C++ 9.0 on Python 2.7 on Windows,
 #   which is not available by default on GitHub Actions
-wrapt>=1.12,<1.13; sys_platform == 'win32' and python_version == '2.7'
 wrapt>=1.12; python_version >= '3.5'
 # isort 5.0.0 removed support for py27,py35
 # isort 4.2.8 fixes a pylint issue with false positive on import order of ssl on Windows

minimum-constraints.txt

@@ -213,16 +213,13 @@ autodocsumm==0.2.5; python_version >= '3.6'
 Babel==2.7.0
 
 # PyLint (no imports, invoked via pylint script):
-pylint==1.6.4; python_version == '2.7'
 pylint==2.5.2; python_version == '3.5'
 pylint==2.10.0; python_version >= '3.6'
-astroid==1.4.9; python_version == '2.7'
 astroid==2.4.0; python_version == '3.5'
 astroid==2.7.2; python_version >= '3.6'
 typed-ast==1.4.0; python_version >= '3.6' and python_version < '3.8' and implementation_name=='cpython'
-lazy-object-proxy==1.4.3; python_version == '2.7'
 lazy-object-proxy==1.4.3; python_version >= '3.5'
-wrapt==1.12
+wrapt==1.12; python_version >= '3.5'
 isort==4.3.8
 tomlkit==0.10.1; python_version >= '3.7'