[v11.0.x] Chore: update go version used in bump-version so it works with the new format (#85724)

Chore: update go version used in `bump-version` so it works with the new format (#85111)

update go version used in bump-version

(cherry picked from commit 4974a89316)

Co-authored-by: Ashley Harrison <ashley.harrison@grafana.com>

.github/workflows/bump-version.yml

@@ -58,7 +58,7 @@ jobs:
       # Go is required for also updating the schema versions as part of the precommit hook:
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21'
       - uses: actions/setup-node@v4
         with:
           node-version: '18'