Update docker.elastic.co/wolfi/chainguard-base:latest Docker digest to 6387bd4 (#123386)

This PR contains the following updates:

| Package | Update | Change | |---|---|---| |
docker.elastic.co/wolfi/chainguard-base | digest | `d74b1fd` ->
`6387bd4` |

---

### Configuration

📅 **Schedule**: Branch creation - "after 1pm on tuesday" (UTC),
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

---

This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4xMDcuMCIsInVwZGF0ZWRJblZlciI6IjM5LjEwNy4wIiwidGFyZ2V0QnJhbmNoIjoiOC4xNiIsImxhYmVscyI6WyI6RGVsaXZlcnkvUGFja2FnaW5nIiwiPm5vbi1pc3N1ZSIsIlRlYW06RGVsaXZlcnkiLCJhdXRvLW1lcmdlLXdpdGhvdXQtYXBwcm92YWwiXX0=-->

Author: elastic-renovate-prod[bot]

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/DockerBase.java

@@ -31,7 +31,7 @@ public enum DockerBase {
     // Chainguard based wolfi image with latest jdk
     // This is usually updated via renovatebot
     // spotless:off
-    WOLFI("docker.elastic.co/wolfi/chainguard-base:latest@sha256:d74b1fda6b7fee2c90b410df258e005c049e0672fe16d79d00e58f14fb69f90b",
+    WOLFI("docker.elastic.co/wolfi/chainguard-base:latest@sha256:6387bd4c462007eaecaf13a423aea99c8a8452da09244c129703324aa97769c6",
         "-wolfi",
         "apk"
     );