don't use testing repositories for pg16, it's released #1387

Job	Run time
Build package (el/7)	6m 21s
Build package (el/8)	8m 30s
Build package (ol/7)	4m 2s
Build package (debian/buster)	7m 32s
Build package (debian/bullseye)	7m 45s
Build package (debian/bookworm)	12m 15s
Build package (ubuntu/focal)	7m 43s
Build package (ubuntu/jammy)	9m 11s
Build package (ubuntu/kinetic)	9m 23s
	1h 12m 42s

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