chore:bump version to 0.12.6 #1222

Job	Run time
setup alpine-3.17 CC gcc	19m 34s
setup alpine-3.17 CC clang	15m 54s
tests-1 alpine-3.17 Ruby 3.2.6 CC gcc	8m 34s
tests-2 alpine-3.17 Ruby 3.2.6 CC gcc	13m 7s
tests-1 alpine-3.17 Ruby 3.3.6 CC gcc	14m 27s
tests-2 alpine-3.17 Ruby 3.3.6 CC gcc	19m 46s
tests-1 alpine-3.17 Ruby 3.4.1 CC gcc	14m 24s
tests-1-app alpine-3.17 Ruby 3.2.6 CC gcc	4m 5s
tests-2 alpine-3.17 Ruby 3.4.1 CC gcc	20m 29s
tests-1 alpine-3.17 Ruby 3.2.6 CC clang	4m 39s
tests-1-app alpine-3.17 Ruby 3.3.6 CC gcc	10m 13s
tests-2 alpine-3.17 Ruby 3.2.6 CC clang	8m 4s
tests-1 alpine-3.17 Ruby 3.3.6 CC clang	8m 30s
tests-1-app alpine-3.17 Ruby 3.4.1 CC gcc	11m 3s
tests-2 alpine-3.17 Ruby 3.3.6 CC clang	12m 2s
tests-1 alpine-3.17 Ruby 3.4.1 CC clang	9m 30s
tests-1-app alpine-3.17 Ruby 3.2.6 CC clang	3m 28s
tests-2 alpine-3.17 Ruby 3.4.1 CC clang	12m 50s
tests-1-app alpine-3.17 Ruby 3.3.6 CC clang	7m 47s
tests-1-app alpine-3.17 Ruby 3.4.1 CC clang	8m 0s
test-on-alpine-latest	13s
	3h 46m 39s

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