golang: Update to 1.22.6

[ermo]

Packaging changes:

• GOROOT_FINAL was deprecated for 1.21, so removed that from the build
• CGO_FLAGS hack is no longer necessary, so removed that
• Update stateless patch

Release notes:

• 1.21.0
• 1.21.x
• 1.22.0
• 1.22.x

[ReillyBrogan]

I'm not really sure how it's supposed to work it's way into the install but we need go.env and a patch like this: https://github.com/getsolus/packages/blob/main/packages/g/golang/files/0001-solus-Use-local-toolchain.patch

Without this packages might end up trying to download their own golang binaries during the build and ignore the system one.