Update envoy-wasm SHA

[Shikugawa]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

[istio-testing]

@Shikugawa: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
test-tsan_proxy	e917519	link	/test test-tsan_proxy
test-asan_proxy	e917519	link	/test test-asan_proxy
release-test_proxy	e917519	link	/test release-test_proxy
test_proxy	e917519	link	/test test_proxy
check-wasm_proxy	e917519	link	/test check-wasm_proxy

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[bianpengyuan]

Hi this needs some code change and I've already had a pending branch for this: bianpengyuan@6c31bc0. I am waiting for Lizan's change on stats prefix before creating a PR: envoyproxy/envoy#11808

[Shikugawa]

Hi this needs some code change and I've already had a pending branch for this: bianpengyuan@6c31bc0. I am waiting for Lizan's change on stats prefix before creating a PR: envoyproxy/envoy#11808

@bianpengyuan Sure. But, this PR is not required anymore. Thank you for pointing out.