Update Go version to 1.26.1

Daniel Keenanrequested to merge
update-go-1.26.1 into main
  • Updates Go to 1.26.1.
  • Removes GOEXPERIMENT=cacheprog, as the cacheprog experiment has since graduated and is rejected by Go 1.26.1 with the error: go: unknown GOEXPERIMENT cacheprog.
  • Sets GOTOOLCHAIN=local in the CI image to prevent silent toolchain downloads, ensuring that the pinned Go version is the one actually used to build GitLab Runner.
Edited by Daniel Keenan

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