Remove double quotes

Author: stasadev

tests/test.bats

@@ -76,7 +76,7 @@ health_checks() {
   if [ "${USE_CUSTOM_NODE:-}" = "true" ]; then
     run ddev exec node -v
     assert_success
-    assert_output --regexp "^v18\\.\\d+\\.\\d+$"
+    assert_output --regexp '^v18\.\d+\.\d+$'
   fi
 }