Use standard paths filter syntax for global recursive extension match

Although the other works as well, this is the style specified in the official GitHub Actions reference and used in the
"template" workflow.

Author: per1234

.github/workflows/check-code-generation-task.yml

@@ -11,15 +11,15 @@ on:
       - "Taskfile.yml"
       - "go.mod"
       - "go.sum"
-      - "**/*.go"
+      - "**.go"
       - "etc/schemas/**/*.json"
   pull_request:
     paths:
       - ".github/workflows/check-code-generation-task.ya?ml"
       - "Taskfile.yml"
       - "go.mod"
       - "go.sum"
-      - "**/*.go"
+      - "**.go"
       - "etc/schemas/**/*.json"
 
 jobs:

.github/workflows/test-go-task.yml

@@ -13,15 +13,15 @@ on:
       - "Taskfile.yml"
       - "go.mod"
       - "go.sum"
-      - "**/*.go"
+      - "**.go"
       - "**/testdata/**"
   pull_request:
     paths:
       - ".github/workflows/test-go-task.ya?ml"
       - "Taskfile.yml"
       - "go.mod"
       - "go.sum"
-      - "**/*.go"
+      - "**.go"
       - "**/testdata/**"
   workflow_dispatch:
   repository_dispatch: