chore(flux): update image ghcr.io/fluxcd/flux-manifests v2.6.3 → v2.6.4 (clustertool) (#37275)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[ghcr.io/fluxcd/flux-manifests](https://redirect.github.com/fluxcd/flux2)
| patch | `v2.6.3` -> `v2.6.4` |

---

### Release Notes

<details>
<summary>fluxcd/flux2 (ghcr.io/fluxcd/flux-manifests)</summary>

###
[`v2.6.4`](https://redirect.github.com/fluxcd/flux2/releases/tag/v2.6.4)

[Compare
Source](https://redirect.github.com/fluxcd/flux2/compare/v2.6.3...v2.6.4)

#### Highlights

Flux v2.6.4 is a patch release that comes with various fixes. Users are
encouraged to upgrade for the best experience.

Fixes:

- Fix for SOPS decryption with US Government KMS keys failing with the
error:

```
STS: AssumeRoleWithWebIdentity, https response error\n   StatusCode: 0, RequestID: ,
request send failed, Post\n \"https://sts.arn.amazonaws.com/\": dial tcp:
lookupts.arn.amazonaws.com on 10.100.0.10:53: no such host
```

#### Components changelog

- kustomize-controller
[v1.6.1](https://redirect.github.com/fluxcd/kustomize-controller/blob/v1.6.1/CHANGELOG.md)

#### CLI changed

- \[release/v2.6.x] Update toolkit components by
[@&#8203;fluxcdbot](https://redirect.github.com/fluxcdbot) in
[https://github.com/fluxcd/flux2/pull/5444](https://redirect.github.com/fluxcd/flux2/pull/5444)

**Full Changelog**:
https://github.com/fluxcd/flux2/compare/v2.6.3...v2.6.4

</details>

---

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clustertool/embed/generic/root/repositories/oci/flux-manifests.yaml

@@ -9,4 +9,4 @@ spec:
   interval: 10m
   url: oci://ghcr.io/fluxcd/flux-manifests
   ref:
-    tag: v2.6.3
+    tag: v2.6.4