ci(mergify): upgrade configuration to current format #2326

Job	Run time
conformance	1m 36s
build (2_12, e2e)	3m 16s
build (2_12, test)	7m 52s
build (2_13, e2e)	4m 6s
build (2_13, test)	10m 38s
build (3, e2e)	4m 6s
build (3, test)	8m 45s
build (2_12, examples_and_formatting)	2m 46s
build (2_13, scala3_compat_test)	8m 31s
build (3, scala3_compat_test)	9m 32s
ci-passed	1s
	1h 1m 9s

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