refactor: remove curl fallback #1427

Job	Run time
matrix-prep-bazelversion	3s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	3m 9s
test (ubuntu-latest, 7.1.1, ., false)	3m 8s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	2m 37s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	2m 6s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	2m 12s
test (ubuntu-latest, 7.1.1, e2e/pull, true)	3m 9s
test (ubuntu-latest, 6.4.0, ., true)	3m 0s
test (ubuntu-latest, 6.4.0, ., false)	3m 11s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	1m 58s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	2m 11s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 4s
test (ubuntu-latest, 6.4.0, e2e/pull, true)	1m 59s
test (macos-13, 7.1.1, ., true)	3m 20s
test (macos-13, 7.1.1, ., false)	3m 9s
test (macos-13, 7.1.1, e2e/smoke, true)	2m 55s
test (macos-13, 7.1.1, e2e/smoke, false)	2m 57s
	43m 9s

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