git-artifacts: stop building `mingw-w64-i686-git` #1443

Job	Run time
minimal-sdk-artifact	7m 39s
test-minimal-sdk / assorted-validations	9s
test-minimal-sdk / test-minimal-sdk (6)	3m 34s
test-minimal-sdk / test-minimal-sdk (9)	5m 54s
test-minimal-sdk / test-minimal-sdk (8)	5m 12s
test-minimal-sdk / test-minimal-sdk (13)	7m 54s
test-minimal-sdk / test-minimal-sdk (5)	5m 1s
test-minimal-sdk / test-minimal-sdk (0)	6m 16s
test-minimal-sdk / test-minimal-sdk (2)	5m 0s
test-minimal-sdk / test-minimal-sdk (11)	4m 20s
test-minimal-sdk / test-minimal-sdk (15)	6m 53s
test-minimal-sdk / test-minimal-sdk (16)	7m 20s
test-minimal-sdk / test-minimal-sdk (10)	4m 3s
test-minimal-sdk / test-minimal-sdk (7)	4m 50s
test-minimal-sdk / test-minimal-sdk (4)	6m 39s
test-minimal-sdk / test-minimal-sdk (12)	10m 3s
test-minimal-sdk / test-minimal-sdk (1)	4m 45s
test-minimal-sdk / test-minimal-sdk (3)	5m 38s
test-minimal-sdk / test-minimal-sdk (14)	5m 29s
publish-release-assets	29s
	1h 47m 8s

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