chore(v1): release 1.37.12 (#2538)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

chore(main): release 2.21.0 (#2532)

* chore(main): release 2.21.0

* chore: Update documentation to latest version.

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Co-authored-by: kgala2 <galakp@google.com>

chore(main): release 2.20.0 (#2516)

* chore(main): release 2.20.0

* docs: Update documentation to latest version.

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Co-authored-by: Jonathan Hess <hessjc@google.com>

chore(v1): release 1.37.11 (#2524)

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chore(main): release 2.19.0 (#2507)

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chore(v1): release 1.37.10 (#2502)

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chore(main): release 2.18.3 (#2500)

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chore(main): release 2.18.2 (#2488)

* chore(main): release 2.18.2

* docs: Update docs to show the latest version in the licenses url.

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Co-authored-by: Jonathan Hess <hessjc@google.com>

chore(v1): release 1.37.9 (#2486)

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chore(main): release 2.18.1 (#2483)

* chore(main): release 2.18.1

* chore: updates proxy docs version to v2.18.1

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Co-authored-by: kgala2 <galakp@google.com>