Install pandoc in GitHub lint action

Author: jupblb

.github/workflows/test.yml

@@ -11,7 +11,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
+
+    - name: Install pandoc
+      uses: pandoc/actions/setup@v1
 
     - name: Set up Python
       uses: actions/setup-python@v5
@@ -28,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - name: Install Neovim
       uses: rhysd/action-setup-vim@v1