fix github patch url and update GPG pub key

YongMing Zhangrequested to merge
aimixsaka/singularity:fix-pr-gpg into main
  • Add missing .diff suffix for github pr patch
  • Update outdated GPG key with gpg --refresh-keys error log: 
    ==> Verifying source file signatures with gpg...
  singularity-1.00.tar.gz ... FAILED (unknown public key A65B78DBE67C7AAC)
==> ERROR: One or more PGP signatures could not be verified!
==> ERROR: Could not download sources.

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