Prepare for v2.5.31 release #1300

Job	Run time
Add-on testing (ubuntu-latest, 3.8)	2m 2s
Add-on testing (ubuntu-latest, 3.9)	2m 5s
Add-on testing (ubuntu-latest, 3.10)	1m 55s
Add-on testing (ubuntu-latest, 3.11)	1m 50s
Add-on testing (windows-latest, 3.8)	2m 14s
Add-on testing (windows-latest, 3.9)	2m 24s
Add-on testing (windows-latest, 3.10)	2m 17s
Add-on testing (windows-latest, 3.11)	2m 15s
Add-on testing (ubuntu-20.04, 2.7)	4m 27s
Add-on testing (ubuntu-20.04, 3.5)	2m 12s
Add-on testing (ubuntu-20.04, 3.6)	2m 1s
Add-on testing (windows-latest, 2.7)	2m 53s
	28m 35s

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