fix: Bump regenerator and fix Add changeset condition

.changeset/smart-moments-enter.md

@@ -0,0 +1,3 @@
+---
+"@rebilly/client-php": patch
+---

.github/workflows/update.yaml

@@ -86,8 +86,13 @@ jobs:
           fi
 
       - name: Summarize spec diff
+        id: summarize
         working-directory: ./sdk
-        run: node ./scripts/summarize-spec-diff.js /tmp/spec-diff.json > /tmp/changeset-body.md || true
+        run: |
+          node ./scripts/summarize-spec-diff.js /tmp/spec-diff.json > /tmp/changeset-body.md
+          if [ -s /tmp/changeset-body.md ]; then
+            echo "has_content=true" >> $GITHUB_OUTPUT
+          fi
 
       - name: Login to GitHub Registry
         uses: docker/login-action@v3
@@ -147,13 +152,9 @@ jobs:
         run: cp ../api-definitions/catalog/all.yaml .openapi-snapshot.yaml
 
       - name: Add changeset
-        if: hashFiles('/tmp/changeset-body.md') != ''
+        if: steps.summarize.outputs.has_content == 'true'
         working-directory: ./sdk
         run: |
-          if [ ! -s /tmp/changeset-body.md ]; then
-            echo "Spec diff produced no entries; skipping changeset."
-            exit 0
-          fi
           npm ci
           node ./scripts/add-changeset.js ${{ steps.oasdiff.outputs.bump }} "$(cat /tmp/changeset-body.md)"
         env: