Request for trunk upgrade to Sync go Runtime with go.mod Toolchain

[vtsachev]

Currently, trunk upgrade does not automatically update the go runtime in trunk.yaml to match the toolchain version specified in go.mod. This causes failures when running trunk check, requiring users to manually update the runtime version in trunk.yaml.

Request:
Enhance trunk upgrade to check for Go version mismatches and update trunk.yaml accordingly, reducing friction for developers.