release: update-manpages: revert color filtering

We pull a pinned help2man from cipd now, so we should get stable
behavior between developers.  That means the color filtering should
not be necessary anymore, and we can drop the logic & unittest.

Change-Id: Ib53e1ce7f8d610d7f624c9a019c79dc5f438ac0d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/582402
Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>

release/update_manpages.py

@@ -30,8 +30,7 @@ import tempfile
 from typing import List
 
 
-# NB: This script is currently imported by tests/ to unittest some logic.
-assert sys.version_info >= (3, 6), "Python 3.6+ required"
+assert sys.version_info >= (3, 9), "Release framework requires Python 3.9+"
 
 
 THIS_FILE = Path(__file__).resolve()
@@ -182,7 +181,6 @@ def replace_regex(data):
     """
     regex = (
         (r"(It was generated by help2man) [0-9.]+", r"\g<1>."),
-        (r"^\033\[[0-9;]*m([^\033]*)\033\[m", r"\g<1>"),
         (r"^\.IP\n(.*:)\n", r".SS \g<1>\n"),
         (r"^\.PP\nDescription", r".SH DETAILS"),
     )