ci: only test with bazel 6, 7 #1245

Job	Run time
matrix-prep-os	1s
matrix-prep-bazelversion	5s
test (ubuntu-latest, 6.4.0, ., true)	4m 25s
test (ubuntu-latest, 6.4.0, ., false)	1m 13s
test (ubuntu-latest, 6.4.0, e2e/custom_registry, false)	1m 4s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	53s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	1m 0s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	36s
test (ubuntu-latest, 6.4.0, e2e/crane_as_registry, true)	41s
test (ubuntu-latest, 6.4.0, e2e/crane_as_registry, false)	43s
test (ubuntu-latest, 6.4.0, e2e/pull, true)	1m 39s
test (ubuntu-latest, 6.4.0, ., true)	3m 31s
test (ubuntu-latest, 6.4.0, ., false)	2m 56s
test (ubuntu-latest, 6.4.0, e2e/custom_registry, false)	48s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	46s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	45s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	57s
test (ubuntu-latest, 6.4.0, e2e/crane_as_registry, true)	54s
test (ubuntu-latest, 6.4.0, e2e/crane_as_registry, false)	42s
test (ubuntu-latest, 6.4.0, e2e/pull, true)	1m 40s
	25m 19s

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