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update go version to 1.15.11 in github workflows (#1692)
xixi authored
* update go version to 1.15.11 in github workflows
Signed-off-by: default avatarhexilee <i@hexilee.me>

* downgrade go version of test/cmd/e2e_helper to 1.15
Signed-off-by: default avatarhexilee <i@hexilee.me>
Co-authored-by: default avatarTi Chi Robot <71242396+ti-chi-bot@users.noreply.github.com>
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