Revert erroneous change to GPG blog publication date

[sxa]

#2271 changed the date on the GPG blog making it look new and appearing at the top of the blog list. This PR reverts that change.

Checklist

• npm test passes
• documentation is changed or added (if applicable)
• permission has been obtained to add new logo (if applicable)
• contribution guidelines followed here

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[codecov]

Codecov Report

Merging #2328 (750ed58) into main (f4039c4) will not change coverage.
Report is 15 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2328   +/-   ##
=======================================
  Coverage   99.20%   99.20%           
=======================================
  Files          87       87           
  Lines        6542     6542           
  Branches      552      552           
=======================================
  Hits         6490     6490           
  Misses         52       52           

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