CI: brew uninstall node@20 in .cirrus.yml

Apparently it's not the "node" cask anymore in the base CI image,
it's the "node@20" cask. Wow.

The workaround of uninstalling this is still needed,
it's just that the package name has changed.

.cirrus.yml

@@ -134,6 +134,7 @@ silicon_mac_task:
     ROLLING_UPLOAD_TOKEN: ENCRYPTED[f935c396a9f4bca108ec2fdedb00dbc9be2f4c411f100d577acdab42db59ea134be059ce8535396db8222a2b1eb68c27]
   prepare_script:
     - brew update
+    - brew uninstall node@20
     - brew install git python@$PYTHON_VERSION python-setuptools
     - git submodule init
     - git submodule update
@@ -198,6 +199,7 @@ silicon_mac_task:
 #     - arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
 #     - export PATH="/usr/local/bin:$PATH"
 #     - arch -x86_64 brew update
+#     - arch -x86_64 brew uninstall node@20
 #     - arch -x86_64 brew install node@16 git python@$PYTHON_VERSION python-setuptools
 #     - ln -s /usr/local/bin/python$PYTHON_VERSION /usr/local/bin/python
 #     - npm install -g yarn