[CI] Install Swig on Mac (cyberbotics#6590)

* [ci] install swig on mac

* rerun ci

* test backing out all changes

* Revert "test backing out all changes"

This reverts commit 06a6394.

Author: CoolSpy3

.github/workflows/test_suite_mac.yml

@@ -42,9 +42,10 @@ jobs:
          fetch-depth: 15
     - name: Install Webots Compilation Dependencies
       run: |
-        # swig wget and cmake are already installed
+        # wget and cmake are already installed
         pip install setuptools
         npm install -g appdmg
+        brew install swig
     - name: Set Commit SHA in Version
       if: ${{ github.event_name == 'schedule' }}
       run: python scripts/packaging/set_commit_and_date_in_version.py $(git log -1 --format='%H')

.github/workflows/test_suite_mac_develop.yml

@@ -38,9 +38,10 @@ jobs:
          ref: develop
     - name: Install Webots Compilation Dependencies
       run: |
-        # swig wget and cmake are already installed
+        # wget and cmake are already installed
         pip install setuptools
         npm install -g appdmg
+        brew install swig
     - name: Set Commit SHA in Version
       if: ${{ github.event_name == 'schedule' }}
       run: python scripts/packaging/set_commit_and_date_in_version.py $(git log -1 --format='%H')