Bump flipt-io/flipt from v1.54.2 to v1.55.0 in /projects/feature-flags/container (#4642)

Bump flipt-io/flipt in /projects/feature-flags/container

Bumps [flipt-io/flipt](https://github.com/flipt-io/flipt) from v1.54.2 to v1.55.0.
- [Release notes](https://github.com/flipt-io/flipt/releases)
- [Changelog](https://github.com/flipt-io/flipt/blob/main/CHANGELOG.md)
- [Commits](flipt-io/flipt@v1.54.2...v1.55.0)

---
updated-dependencies:
- dependency-name: flipt-io/flipt
  dependency-type: direct:production
...

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projects/feature-flags/container/Dockerfile

@@ -1,4 +1,4 @@
-FROM ghcr.io/flipt-io/flipt:v1.54.2
+FROM ghcr.io/flipt-io/flipt:v1.55.0
 
 # Run any pending migrations on startup
 CMD ["sh", "-c", "./flipt migrate && ./flipt"]