Update pkgdown.yml

Author: Raphael Sonabend

.github/workflows/pkgdown.yml

@@ -30,6 +30,9 @@ jobs:
           key: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-${{ hashFiles('.github/depends.Rds') }}
           restore-keys: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-
 
+      - name: Install system dependencies
+        run: brew install harfbuzz fribidi
+
       - name: Install dependencies
         run: |
           remotes::install_deps(dependencies = TRUE)