chore(deps): bump alpine from 3.21.0 to 3.21.2 in /e2e (#4284)

Bumps alpine from 3.21.0 to 3.21.2.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Gergely Brautigam <182850+Skarlso@users.noreply.github.com>
Co-authored-by: Moritz Johner <moolen@users.noreply.github.com>

e2e/Dockerfile

@@ -16,7 +16,7 @@ COPY . .
 WORKDIR /usr/src/app/e2e
 RUN make e2e-bin
 
-FROM alpine:3.21.0@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45
+FROM alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099
 RUN apk add -U --no-cache \
     ca-certificates \
     bash \