build: add cometbft v0.37.3 changelog + bump Go

[julienrbrt]

Description

Follow-up of: #18515
We are somewhat forced to bump our Go minimum version.

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[julienrbrt]

We need to tell apps to bump this as well, when they use the proto-builder.
To be honest, still not a fan to have to bump our miniumun go version, while we won't take advantage of the Go 1.21 features and apps can already still build their app with Go 1.21

[julienrbrt]

We won't bump. Chains can bump themselves.