update version to 1.2.8 #1478

Job	Run time
arm64 tests on Ubuntu (pg13, host)	8m 12s
x86_64 tests (pg13, ubuntu-latest, host)	4m 58s
arm64 tests on Ubuntu (pg13, postgrestd)	8m 35s
x86_64 tests (pg13, ubuntu-latest, postgrestd)	4m 53s
arm64 tests on Ubuntu (pg14, host)	8m 33s
x86_64 tests (pg14, ubuntu-latest, host)	4m 58s
arm64 tests on Ubuntu (pg14, postgrestd)	8m 7s
x86_64 tests (pg14, ubuntu-latest, postgrestd)	4m 50s
arm64 tests on Ubuntu (pg15, host)	8m 33s
x86_64 tests (pg15, ubuntu-latest, host)	5m 46s
x86_64 tests (pg15, ubuntu-latest, postgrestd)	5m 24s
arm64 tests on Ubuntu (pg15, postgrestd)	8m 7s
arm64 tests on Ubuntu (pg16, host)	8m 11s
x86_64 tests (pg16, ubuntu-latest, host)	5m 3s
x86_64 tests (pg16, ubuntu-latest, postgrestd)	5m 3s
arm64 tests on Ubuntu (pg16, postgrestd)	8m 37s
	1h 47m 50s

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