Bump body-parser, path-to-regexp and express in /examples

Updates `body-parser` from 1.20.0 to 1.20.3.
- [Release notes](https://github.com/expressjs/body-parser/releases)
- [Changelog](https://github.com/expressjs/body-parser/blob/master/HISTORY.md)
- [Commits](expressjs/body-parser@1.20.0...1.20.3)

Updates `path-to-regexp` from 0.1.7 to 0.1.10
- [Release notes](https://github.com/pillarjs/path-to-regexp/releases)
- [Changelog](https://github.com/pillarjs/path-to-regexp/blob/master/History.md)
- [Commits](pillarjs/path-to-regexp@v0.1.7...v0.1.10)

Updates `express` from 4.19.2 to 4.21.0
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.0/History.md)
- [Commits](expressjs/express@4.19.2...4.21.0)

---
updated-dependencies:
- dependency-name: body-parser
  dependency-type: direct:production
- dependency-name: path-to-regexp
  dependency-type: indirect
- dependency-name: express
  dependency-type: direct:production
...

examples/digital-identity/package.json

@@ -13,10 +13,10 @@
     "lint": "node_modules/.bin/eslint *.js"
   },
   "dependencies": {
-    "body-parser": "1.20.0",
+    "body-parser": "1.20.3",
     "dotenv": "16.0.2",
     "ejs": "3.1.10",
-    "express": "4.19.2",
+    "express": "4.21.0",
     "yoti": "file:../.."
   },
   "devDependencies": {