Bump prefect from 2.11.0 to 2.14.3 in /examples/simple (#32)

Bumps [prefect](https://github.com/PrefectHQ/prefect) from 2.11.0 to 2.14.3.
- [Release notes](https://github.com/PrefectHQ/prefect/releases)
- [Changelog](https://github.com/PrefectHQ/prefect/blob/main/RELEASE-NOTES.md)
- [Commits](PrefectHQ/prefect@2.11.0...2.14.3)

---
updated-dependencies:
- dependency-name: prefect
  dependency-type: direct:production
...

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

examples/simple/requirements.txt

@@ -1 +1 @@
-prefect==2.11.0
+prefect==2.14.3