algo/tests/Makefile: Longer timeout for should.py with valgrind

Executing valgrind can take more time, thus we need to increase the default timeout to make
sure the program has time to properly execute.

algo/tests/Makefile

@@ -122,7 +122,7 @@ curated-vdj.zip: $(SHOULD_VDJ_ARCHIVE)
 
 valgrind_should: vidjil
 	$(MAKE) -C "$(REPORTS_PATH)" clean_valgrind
-	time python3 should.py --launcher "$(VALGRIND_CMD)" --extra=--clean-memory $(SHOULD)
+	time python3 should.py --timeout 300 --launcher "$(VALGRIND_CMD)" --extra=--clean-memory $(SHOULD)
 
 valgrind_%:
 	LAUNCHER="$(VALGRIND_CMD)" $(MAKE) $(patsubst valgrind_%,%,$@)