Bump to golang 1.20 to pick up go1.19.6 / go1.20.1 CVE fixes
Go 1.18 is already EOL and doesn't have fixes available. Signed-off-by: Jingyuan Liang <jingyuanliang@google.com>
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Go 1.18 is already EOL and doesn't have fixes available. Signed-off-by: Jingyuan Liang <jingyuanliang@google.com>