Bump pyrefly to 0.42.1 and remove 'sed' workaround. (#1145)

Author: rchen152

.github/workflows/lint.yml

@@ -46,6 +46,4 @@ jobs:
       - name: Run pre-commit
         run: |
           source .venv/bin/activate
-          # TODO(rchen152): Delete this when warnings do not cause failures
-          sed -i '/search-path/d' pyproject.toml
           pre-commit run --all-files

lint.sh

@@ -9,7 +9,7 @@ fi
 if [ "$ACTION" = "install" ];
 then
     set -ex
-    pip install ruff==0.14.2 pyrefly==0.42.0
+    pip install ruff==0.14.2 pyrefly==0.42.1
     exit 0
 fi