Fix CHANGELOG entry for v0.11.2 release

Drop Alpine `oldstable` image updates from this release:

- go-ci-oldstable-alpine-buildx86
- go-ci-oldstable-alpine-buildx64

While intended for this release, they were not included.

CHANGELOG.md

@@ -37,10 +37,6 @@ The following types of changes will be recorded in this file:
   - oldstable images
     - Update `go-ci-oldstable` from `1.19.10` to `1.19.11`
     - Update `go-ci-oldstable-build` from `1.19.10` to `1.19.11`
-    - Update `go-ci-oldstable-alpine-buildx86` from `1.20.5-alpine3.18` to
-      `1.20.6-alpine3.18`
-    - Update `go-ci-oldstable-alpine-buildx64` from `1.20.5-alpine3.18` to
-      `1.20.6-alpine3.18`
   - stable images
     - Update `go-ci-stable` from `1.20.5` to `1.20.6`
     - Update `go-ci-stable-build` from `1.20.5` to `1.20.6`