The class is inheriting from object, which is implicit under Python 3,
hence can be safely removed from bases.

The methods startswith and endswith for string instances accept two types of
Python constructs as the first argument. The types are:
- a Python string, or
- a tuple of strings

Merge `endswith` checks

Useless inheritance from object

This shows clearly with '3.10' which is different from '3.1'.

CI: python-version should be a string, not a float

CI: Automatically update GitHub Actions in the future

This fixes the following error message that appeared when upgrading Numpy
from Versioneer 0.19 to 0.26:
	Traceback (most recent call last):
	  File "setup.py", line 102, in <module>
	    cmdclass = versioneer.get_cmdclass(numpy_cmdclass)
	  File "/cygdrive/d/a/numpy/numpy/versioneer.py", line 1980, in get_cmdclass
	    class cmd_egg_info(_egg_info):
	UnboundLocalError: local variable '_egg_info' referenced before assignment

Always bootstrap versioneer and use the newly bootstrapped version
in `setup.py`.  This avoids compatibility problems when there is
an old version of versioneer installed (<= 0.23) that does not define
`get_version()` and therefore causes `setup.py` to fail.

Thanks to Chris Markiewicz for the suggested solution.

Fixes #343

FIX: Always bootstrap in setup.py to avoid incompatibility with old versioneer

FIX: mixup between _egg_info and _sdist