[PR] GH-46242: [Release] Don't show gpg signature when getting release time [arrow]

[via GitHub]

assignUser opened a new pull request, #46243:
URL: https://github.com/apache/arrow/pull/46243

   ### Rationale for this change
   post-12-bumb-versions.sh doesn't work with git's log.showSignature=true
   
   ### What changes are included in this PR?
   Don't show the signature
   
   ### Are these changes tested?
   CI, locally
   
   ### Are there any user-facing changes?
   No


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