Update to "tmpl-go" template repository version 0.6.0 (#17)

Update to "tmpl-go" version 0.6.0 [1] which reduces "Dependabot PR noise
for the NPM package ecosystem [2].

[1]: https://github.com/svengreb/tmpl-go/releases/tag/v0.6.0
[2]: svengreb/tmpl#65

Closes GH-16

.github/dependabot.yml

@@ -33,7 +33,9 @@ updates:
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
+    allow:
+      - dependency-type: "production"
     reviewers:
       - "svengreb"
     labels:

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2
       - name: "Setup Node.js version 14.x"
-        uses: actions/[email protected].2
+        uses: actions/[email protected].3
         with:
           node-version: "14.x"
       - name: Install Node modules