3.11: "Check if generated files are up to date" is failing due to autoconf version #105455

On all 3.11 PRs that touch non-docs files (e.g. #105417), the Check if generated files are up to date check is currently failing on the check grep "Generated by GNU Autoconf 2.69" configure.

This is because d2340ef, which created 3.11.4, updated configure to be generated by Autoconf 2.71. @pablogsal why was this done? Should we update the build.yml file to check for 2.71 instead of 2.69?

Linked PRs

• [3.11] gh-105455: Regen configure with GNU Autoconf 2.69 #105467
• [3.11] gh-105455: Bump to GNU Autoconf v2.71 (#104925) #105469