Update fastcs requirement in the dev-dependencies group

Updates the requirements on [fastcs](https://github.com/DiamondLightSource/FastCS) to permit the latest version.

Updates `fastcs` to 0.5.0
- [Release notes](https://github.com/DiamondLightSource/FastCS/releases)
- [Commits](DiamondLightSource/FastCS@0.4.0...0.5.0)

---
updated-dependencies:
- dependency-name: fastcs
  dependency-type: direct:production
  dependency-group: dev-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -12,7 +12,7 @@ classifiers = [
 description = "Eiger control system integration with FastCS"
 dependencies = [
     "aiohttp",
-    "fastcs~=0.4.0",
+    "fastcs~=0.5.0",
     "numpy",
     "pillow",
     "typer",