use ubuntu 22 for github actions (decred#3024)

buck54321 · buck54321 · commit 5f71c1a4ae59 · 2024-10-16T23:27:43.000-05:00
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -5,7 +5,7 @@ permissions:
 jobs:
   build-go:
     name: Go CI
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         go: ['1.22', '1.23']
