Upgrade Flux to 2.4.x (#386)

Now that Cozystack 0.16 is out with flux-operator 0.9.0, users that need
it can easily upgrade to Flux 2.4.0

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
	- Upgraded FluxCD version from 2.3.x to 2.4.x.
- Enhanced configuration for several controllers with new command-line
arguments for improved performance and functionality.

- **Bug Fixes**
- Updated resource limits for containers to ensure optimal resource
allocation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Kingdon Barrett <kingdon+github@tuesdaystudios.com>

packages/system/fluxcd/values.yaml

@@ -4,7 +4,7 @@ flux-instance:
       networkPolicy: true
       domain: cozy.local # -- default value is overriden in patches
     distribution:
-      version: 2.3.x
+      version: 2.4.x
       registry: ghcr.io/fluxcd
     components:
       - source-controller