Fixes makefile to also work for zsh

makefile

@@ -1,7 +1,7 @@
 install-for-tests:
 	@echo "--- Installing dependencies for tests ---"
 	# just use the dev dependencies from mteb to keep everything compatible
-	pip install mteb[dev]>=1.13.0
+	pip install "mteb[dev]>=1.13.0"
 
 test:
 	@echo "--- Running tests ---"