Update min go version to 1.20 in preparation for upstream cherry-picks#3

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chris-j-h wants to merge 2 commits intomasterfrom test-go1.20

+134-106

Commits on May 2, 2024

Update min go version to 1.20 in preparation for upstream cherry-picks
chris-j-h
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Commits on May 3, 2024

Test
chris-j-h
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