Update golang patch version to latest 1.19.12 release

[jmhbnz]

What would you like to be added?

A new go patch release has been published:

go1.19.12 (released 2023-08-01) includes a security fix to the crypto/tls package, as well as bug fixes to the assembler and the compiler. See the Go 1.19.12 milestone on our issue tracker for details.

We should update to this version by bumping the version in .go-version file in the main branch.

Once the changes have been merged in main we should backport the changes to release-3.5 and release-3.4 branches as well so the fixes can make it into our next patch releases.

Why is this needed?

Keep etcd projects up to date with the latest patch releases and incorporate the latest security updates.

[z764969689]

I'm keen on solving this, thanks :)

[jmhbnz]

Assigned - Thanks @z764969689!

[ahrtr]

thx @z764969689 . Can you please bump the go version for 3.5 and 3.4 as well?

[z764969689]

@ahrtr sure, I'll do that.

[ahrtr]

@ahrtr sure, I'll do that.

Please also add changelog items for both 3.5 and 3.4.

[jmhbnz]

@ahrtr sure, I'll do that.

Please also add changelog items for both 3.5 and 3.4.

Example pr for reference: #16229

[ahrtr]

All done.