Update release-1.3 and main CHANGELOG with go version bump

[henrybear327]

Reference: etcd-io/etcd#18419

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[ahrtr]

bbolt is used as a library, actually its go version isn't that important.

I tend not to update changelog for golang version bump.

[henrybear327]

bbolt is used as a library, actually its go version isn't that important.

I tend not to update changelog for golang version bump.

Thanks for the context! :) Closing this PR.