Merge pull request #632 from prometheus/superq/go_1.22

Update Go build

Author: beorn7

.circleci/config.yml

@@ -6,7 +6,7 @@ executors:
   # Whenever the Go version is updated here, .promu.yml should also be updated.
   golang:
     docker:
-      - image: cimg/go:1.21
+      - image: cimg/go:1.22
 jobs:
   test:
     executor: golang

.promu.yml

@@ -2,7 +2,7 @@
 go:
     # Whenever the Go version is updated here, .circle/config.yml should also
     # be updated.
-    version: 1.21
+    version: 1.22
 repository:
     path: github.com/prometheus/pushgateway
 build: