Simplify ansible-core dep w/ compatible operator (#346)

* Simplify ansible-core dep w/ compatible operator

The `~=` opeator is similar to `^` in some ecosystems
(NodeJS/Poetry/Rust). It allows to achieve the request of a compatible
release by only allowing the last version segment to be variable.
For example, `~= 2.13.2` is equivalent to `>= 2.13.2, == 2.13.*`.

Ref: https://www.python.org/dev/peps/pep-0440/#compatible-release

* Keep referencing `collection_deps` on the line as the core dep

Co-authored-by: Felix Fontein <felix@fontein.de>

Co-authored-by: Felix Fontein <felix@fontein.de>

src/antsibull/data/ansible-setup_py.j2

@@ -176,7 +176,7 @@ setup(
     packages=['ansible_collections'],
     include_package_data=True,
     install_requires=[
-        '{{ ansible_core_package_name }}>={{ ansible_base_version }},<{{ ansible_base_version.major }}.{{ ansible_base_version.minor + 1 }}',{{ collection_deps }}
+        '{{ ansible_core_package_name }} ~= {{ ansible_base_version }}',{{ collection_deps }}
     ],
     classifiers=[
         'Development Status :: 5 - Production/Stable',