Bump envoyproxy/envoy from v1.33-latest to v1.34-latest in /docker/en… #12981

Job	Run time
setup-environment	1m 22s
gofmt	7m 5s
cross-compile (binaries-darwin_amd64)	5m 32s
coverage	11m 49s
lint	11m 31s
cross-compile (binaries-darwin_arm64)	5m 28s
generate-metrics	5m 58s
cross-compile (binaries-linux_amd64)	5m 15s
cross-compile (binaries-linux_arm64)	5m 8s
test	16m 40s
tidy	2m 2s
cross-compile (binaries-windows_amd64)	5m 34s
cross-compile (binaries-linux_ppc64le)	5m 7s
	1h 28m 31s

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