Bump fluxcd/flux2 from 2.3.0 to 2.4.0 in the ci group

Bumps the ci group with 1 update: [fluxcd/flux2](https://github.com/fluxcd/flux2).


Updates `fluxcd/flux2` from 2.3.0 to 2.4.0
- [Release notes](https://github.com/fluxcd/flux2/releases)
- [Changelog](https://github.com/fluxcd/flux2/blob/main/.goreleaser.yml)
- [Commits](fluxcd/flux2@896e0fa...5350425)

---
updated-dependencies:
- dependency-name: fluxcd/flux2
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: ci
...

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

.github/workflows/tests.yaml

@@ -79,7 +79,7 @@ jobs:
             **/go.sum
             **/go.mod
       - name: Setup Flux CLI
-        uses: fluxcd/flux2/action@896e0fa46d5107a05e953dd0a5261d78a145ec8c # v2.3.0
+        uses: fluxcd/flux2/action@5350425cdcd5fa015337e09fa502153c0275bd4b # v2.4.0
       - name: Set outputs
         id: vars
         run: |
@@ -161,7 +161,7 @@ jobs:
             **/go.sum
             **/go.mod
       - name: Setup Flux CLI
-        uses: fluxcd/flux2/action@896e0fa46d5107a05e953dd0a5261d78a145ec8c # v2.3.0
+        uses: fluxcd/flux2/action@5350425cdcd5fa015337e09fa502153c0275bd4b # v2.4.0
       - name: Set outputs
         id: vars
         run: |
@@ -215,7 +215,7 @@ jobs:
             **/go.sum
             **/go.mod
       - name: Setup Flux CLI
-        uses: fluxcd/flux2/action@896e0fa46d5107a05e953dd0a5261d78a145ec8c # v2.3.0
+        uses: fluxcd/flux2/action@5350425cdcd5fa015337e09fa502153c0275bd4b # v2.4.0
       - name: Set outputs
         id: vars
         run: |