no need to install Python/pip on macOS

Author: vladak

dev/before_install

@@ -49,15 +49,6 @@ elif [[ "$RUNNER_OS" == "macOS" ]]; then
 		exit 1
 	fi
 
-	brew install python3
-	brew upgrade python
-
-	./dev/install-python-packages.sh
-	if [[ $? != 0 ]]; then
-		echo "cannot install Python packages"
-		exit 1
-	fi
-
 	sudo ./dev/install-universal_ctags.sh
 	if [[ $? != 0 ]]; then
 		echo "cannot install Universal ctags"