Update docker.elastic.co/wolfi/chainguard-base-fips:latest Docker digest to 88dc781 (9.0) (#218592)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.elastic.co/wolfi/chainguard-base-fips | digest | `b6d3d24` ->
`88dc781` |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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Bot](https://redirect.github.com/renovatebot/renovate).

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Co-authored-by: elastic-renovate-prod[bot] <174716857+elastic-renovate-prod[bot]@users.noreply.github.com>
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src/dev/build/tasks/os_packages/docker_generator/run.ts

@@ -60,7 +60,7 @@ export async function runDockerGenerator(
   if (flags.fips) {
     imageFlavor += '-fips';
     baseImageName =
-      'docker.elastic.co/wolfi/chainguard-base-fips:latest@sha256:b6d3d24fe575a1ed9c81dc8bc14c03b1e4367ac902c19a388c08dc9931722158';
+      'docker.elastic.co/wolfi/chainguard-base-fips:latest@sha256:88dc781fcdaaffba577c797800832cf5e2ef5641704e06075f4a983ceb2129d4';
   }
 
   // General docker var config