migrate to ftpmirror.gnu.org#11

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sabbene wants to merge 2 commits intoPerlAlien:mainfrom

sabbene:ftpmirror.gnu.org

Commits on Sep 19, 2025

move to ftpmirror.gnu.org becasue ftp.gnu.org is often slow and causes timeouts in builds
sabbene
committed
update github cache/actions to latest version
sabbene
committed