update go version for ci

Author: aaronc

.github/workflows/test.yml

@@ -374,7 +374,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: "1.12"
+          go-version: "1.16"
           cache: true
           cache-dependency-path: schema/go.sum
       - uses: technote-space/get-diff-action@v6.1.2

schema/go.mod

@@ -4,6 +4,6 @@ module cosmossdk.io/schema
 // with all known production releases of the Cosmos SDK. This is to ensure that all historical
 // apps could be patched to support indexing if desired.
 
-go 1.12
+go 1.16
 
 retract v1.0.0