GHA/curl-for-win: don't run if only another CI was changed

Closes #14142

.github/workflows/curl-for-win.yml

@@ -9,9 +9,29 @@ on:
     branches:
       - master
       - '*/ci'
+    paths-ignore:
+      - '**/*.md'
+      - '.azure-pipelines.yml'
+      - '.circleci/**'
+      - '.cirrus.yml'
+      - 'appveyor.*'
+      - 'packages/**'
+      - 'plan9/**'
+      - 'projects/**'
+      - 'winbuild/**'
   pull_request:
     branches:
       - master
+    paths-ignore:
+      - '**/*.md'
+      - '.azure-pipelines.yml'
+      - '.circleci/**'
+      - '.cirrus.yml'
+      - 'appveyor.*'
+      - 'packages/**'
+      - 'plan9/**'
+      - 'projects/**'
+      - 'winbuild/**'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}