Update wiki action

Author: coisa

.github/workflows/wiki.yml

@@ -51,7 +51,12 @@ jobs:
 
             -   name: Check if there are changes
                 id: changes
-                run: echo "changed=$([ -n \"$(git status -s)\" ] && echo true || echo false)" >> $GITHUB_OUTPUT
+                run: |
+                    if [ -n "$(git status -s)" ]; then
+                      echo "changed=true" >> $GITHUB_OUTPUT
+                    else
+                      echo "changed=false" >> $GITHUB_OUTPUT
+                    fi
 
             -   name: Add and commit files
                 if: ${{ steps.changes.outputs.changed == 'true' }}