fix: use pipx instead of global pip

Author: lorenzwalthert

.github/workflows/hook-dependencies-update.yml

@@ -17,7 +17,6 @@ jobs:
       - uses: r-lib/actions/setup-r@v2
         with:
           use-public-rspm: true
-          cache: false
       - name: install runtime dependencies
         run: Rscript -e "install.packages(c('renv', 'jsonlite'))"
       - name: update PPM URL
@@ -27,7 +26,9 @@ jobs:
       - name: update existing packages
         run: Rscript inst/update-dependency-graph-existing-packages.R
       - name: install pre-commit
-        run: pip3 install pre-commit
+        run: |
+          brew install pipx
+          pipx install pre-commit
       - name: auto-release
         run: Rscript -e 'source("renv/activate.R"); renv::restore(); renv::install("."); precommit:::auto_release()' 
       - name: Create Pull Request