[3.13] GH-103484: Tell linkcheck to ignore debian manpage redirects (GH-123019) (#124137)

GH-103484: Tell linkcheck to ignore debian manpage redirects (GH-123019)
(cherry picked from commit 1054a75)

Co-authored-by: Rafael Fontenelle <rffontenelle@users.noreply.github.com>

Author: miss-islington

Doc/conf.py

@@ -547,6 +547,8 @@
     r'https://msdn.microsoft.com/.*': 'https://learn.microsoft.com/.*',
     r'https://docs.microsoft.com/.*': 'https://learn.microsoft.com/.*',
     r'https://go.microsoft.com/fwlink/\?LinkID=\d+': 'https://learn.microsoft.com/.*',
+    # Debian's man page redirects to its current stable version
+    r'https://manpages.debian.org/\w+\(\d(\w+)?\)': r'https://manpages.debian.org/\w+/[\w/\-\.]*\.\d(\w+)?\.en\.html',
     # Language redirects
     r'https://toml.io': 'https://toml.io/en/',
     r'https://www.redhat.com': 'https://www.redhat.com/en',