Revert "build(deps): bump fastify/workflows from 3 to 4 (#206)"

This reverts commit 72ac957.

Author: jsumners

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ on:
 
 jobs:
   test:
-    uses: fastify/workflows/.github/workflows/plugins-ci.yml@v4
+    uses: fastify/workflows/.github/workflows/plugins-ci.yml@v3
     with:
       license-check: true
       lint: true