Change Python version support to match CPython

Currently, we are supporting Python version until their usage falls low-enough. This worked well, when we had fewer users and Python's sliding window moved slower. We have, however, not used the threshold for the last few Python releases and our metrics for determining usage levels are not particularly robust against being overrepresentative of certain usage patterns (we're seeing this in the current usage numbers). Aligning with CPython helps ensure that the maintainers of pip aren't subsidising the cost of EOL Python versions indefinitely.
pypa · Dec 23, 2023 · 8212d9a · 8212d9a
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diff --git a/docs/html/development/release-process.rst b/docs/html/development/release-process.rst
@@ -93,7 +93,8 @@ issues by pip's maintainers.
 Python Support Policy
 ---------------------
 
-In general, a given Python version is supported until its usage on PyPI falls below 5%.
+In general, a given Python version is supported until the end of life for the
+corresponding CPython release.
 This is at the maintainers' discretion, in case extraordinary circumstances arise.
 
 .. _`Feature Flags`:

diff --git a/news/12450.process.rst b/news/12450.process.rst
@@ -0,0 +1 @@
+Align Python version support with CPython timelines, instead of PyPI usage numbers.
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		Align Python version support with CPython timelines, instead of PyPI usage numbers.