ci(mergify): upgrade configuration to current format #2330

Job	Run time
build (2_12, e2e)	3m 20s
build (2_12, test)	11m 34s
conformance	1m 47s
build (2_13, e2e)	3m 46s
build (2_13, test)	13m 13s
build (3, e2e)	4m 6s
build (3, test)	6m 55s
build (2_12, examples_and_formatting)	2m 37s
build (2_13, scala3_compat_test)	7m 4s
build (3, scala3_compat_test)	8m 25s
ci-passed	1s
	1h 2m 48s

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