mail/fetchmail: update to 6.4.34 (critical fix)

CRITICAL BUG FIXES:

• When an SMTP receiver refuses delivery, a message would be deleted from the mail store in spite of a softbounce option that is enabled. Bug report, analysis and patch by Horváth Zsolt. Gitlab, fixes #50.

BUILD NOTE:

• If you are reusing config.cache from prior builds, this may cause issues with finding Python or some libraries. In case of trouble, remove config.cache and retry.

TRANSLATIONS: language translations were updated by this fine person:

• sr: Мирослав Николић (Miroslav Nikolić) [Serbian]

(cherry picked from commit 7c97aaed105433db570af51362721ee1b7ee47b0)
PR: 267083
Approved by: Corey Halpin (maintainer, for branch main - see PR)