Bump axios from 0.21.4 to 0.26.0

Bumps [axios](https://github.com/axios/axios) from 0.21.4 to 0.26.0.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v0.21.4...v0.26.0)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/pdf-handler/package.json

@@ -26,7 +26,7 @@
     "@google-cloud/functions-framework": "1.9.0",
     "@google-cloud/pubsub": "^2.16.3",
     "@google-cloud/storage": "^5.18.1",
-    "axios": "^0.21.4",
+    "axios": "^0.26.0",
     "concurrently": "^6.2.1",
     "pdfjs-dist": "^2.9.359"
   }