github/workflows: Go 1.14 is out, fix test

1.14.0 satisfies ^1.13.6, so the test started failing once Go 1.14 was
released.

This test is going to break again when Go 1.15 is released, so maybe we
need a better fix?

.github/workflows/versions.yml

@@ -19,13 +19,13 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
 
-    - name: setup-go ^1.13.6
+    - name: setup-go ^1.14.0
       uses: ./
       with:
-        go-version: ^1.13.6
+        go-version: ^1.14.0
 
     - name: validate version
-      run: go version | grep "go1.13."
+      run: go version | grep "go1.14."
 
     - name: setup-go 1.13
       uses: ./