Bump actix-web from 4.7.0 to 4.8.0 in /examples (#399)

Bumps [actix-web](https://github.com/actix/actix-web) from 4.7.0 to 4.8.0.
- [Release notes](https://github.com/actix/actix-web/releases)
- [Changelog](https://github.com/actix/actix-web/blob/master/CHANGES.md)
- [Commits](https://github.com/actix/actix-web/compare/web-v4.7.0...web-v4.8.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/Cargo.lock

@@ -219,9 +219,9 @@ dependencies = [
 
 [[package]]
 name = "actix-web"
-version = "4.7.0"
+version = "4.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d6316df3fa569627c98b12557a8b6ff0674e5be4bb9b5e4ae2550ddb4964ed6"
+checksum = "1988c02af8d2b718c05bc4aeb6a66395b7cdf32858c2c71131e5637a8c05a9ff"
 dependencies = [
  "actix-codec",
  "actix-http",