🌱 Update image docker.io/library/alpine to v3.21.2 (#1526)

| datasource | package                  | from   | to     |
| ---------- | ------------------------ | ------ | ------ |
| docker     | docker.io/library/alpine | 3.21.0 | 3.21.2 |

Co-authored-by: syself-bot[bot] <115953087+syself-bot[bot]@users.noreply.github.com>

Author: syself-bot[bot]

images/cache/Dockerfile

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 
-FROM docker.io/library/alpine:3.21.0@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45 AS import-cache
+FROM docker.io/library/alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099 AS import-cache
 
 RUN --mount=type=bind,target=/host-tmp \
     --mount=type=cache,target=/root/.cache \
@@ -27,7 +27,7 @@ RUN --mount=type=bind,target=/host-tmp \
       tar xzf /host-tmp/go-pkg-cache.tar.gz --no-same-owner -C /go/pkg; \
     fi
 
-FROM docker.io/library/alpine:3.21.0@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45 AS cache-creator
+FROM docker.io/library/alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099 AS cache-creator
 RUN --mount=type=cache,target=/root/.cache \
     --mount=type=cache,target=/go/pkg \
     tar czf /tmp/go-build-cache.tar.gz -C /root/.cache/go-build . ; \