Ensure required go version is passed as string because yaml is dumb

Signed-off-by: Alex Sørlie Glomsaas <[email protected]>

.github/workflows/tests.yaml

@@ -23,7 +23,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.20
+          go-version: '1.20'
 
       - name: Go Build Cache
         uses: actions/cache@v2
@@ -65,7 +65,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.20
+          go-version: '1.20'
 
       - name: Go Build Cache
         uses: actions/cache@v2