Bump durable-functions from 1.5.4 to 2.1.1

Bumps [durable-functions](https://github.com/Azure/azure-functions-durable-js) from 1.5.4 to 2.1.1.
- [Release notes](https://github.com/Azure/azure-functions-durable-js/releases)
- [Changelog](https://github.com/Azure/azure-functions-durable-js/blob/v2.x/azure-pipelines-release.yml)
- [Commits](Azure/azure-functions-durable-js@1.5.4...v2.1.1)

---
updated-dependencies:
- dependency-name: durable-functions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -4,7 +4,7 @@
   "description": "This is a static file generator that demonstrates how to build a blob storage processing pipeline with durable functions",
   "main": "index.js",
   "dependencies": {
-    "durable-functions": "^1.2.2",
+    "durable-functions": "^2.1.1",
     "cheerio": "^1.0.0-rc.3",
     "gray-matter": "^4.0.2",
     "remarkable": "^2.0.0",