Update starsessions requirement in /requirements

Updates the requirements on [starsessions](https://github.com/alex-oleshkevich/starsessions) to permit the latest version.
- [Release notes](https://github.com/alex-oleshkevich/starsessions/releases)
- [Commits](alex-oleshkevich/starsessions@v1.2.1...v2.1.0)

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

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

Author: dependabot[bot]

requirements/app/base.txt

@@ -2,7 +2,7 @@ lightning-cloud>=0.5.11
 packaging
 typing-extensions>=4.0.0, <=4.4.0
 deepdiff>=5.7.0, <=5.8.1
-starsessions>=1.2.1, <2.0 # strict
+starsessions>=1.2.1, <3.0 # strict
 fsspec>=2022.5.0, <=2022.7.1
 s3fs>=2022.5.0, <2022.8.3
 croniter>=1.3.0, <1.4.0  # strict; TODO: for now until we find something more robust.