ci: use oldstable and stable Go versions

The upside is, we don't have to bump the versions here every 6 months.

The downside is, CI might break once the new Go is out.

Overall I think it is net positive.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        go: [1.21.x, 1.22.x]
+        go: [oldstable, stable]
 
     steps:
       - name: checkout source code