chore(deps): update docker.io/library/alpine docker tag to v3.21.2

Signed-off-by: cilium-renovate[bot] <134692979+cilium-renovate[bot]@users.noreply.github.com>

Dockerfile

@@ -82,15 +82,15 @@ RUN curl -L https://github.com/libbpf/bpftool/releases/download/${BPFTOOL_TAG}/b
 
 # Get bash-completion manifests and generate tetra CLI bash
 # autocompletions (we don't want all bash-completions in the base-build)
-FROM docker.io/library/alpine:3.21.0@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45 AS cli-autocomplete
+FROM docker.io/library/alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099 AS cli-autocomplete
 COPY --from=tetragon-builder /go/src/github.com/cilium/tetragon/tetra /usr/bin/
 RUN apk add --no-cache bash-completion && \
     tetra completion bash > /etc/bash_completion.d/tetra && \
     chmod a+r /etc/bash_completion.d/tetra
 
 # Almost final step runs on target platform (might need emulation) and
 # retrieves (cross-)compiled binaries from builders
-FROM docker.io/library/alpine:3.21.0@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45 AS base-build
+FROM docker.io/library/alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099 AS base-build
 RUN apk add --no-cache iproute2
 RUN mkdir /var/lib/tetragon/ && \
     mkdir -p /etc/tetragon/tetragon.conf.d/ && \

Dockerfile.operator

@@ -3,7 +3,7 @@
 
 ARG BASE_IMAGE=scratch
 ARG GOLANG_IMAGE=docker.io/library/golang:1.23.4@sha256:7ea4c9dcb2b97ff8ee80a67db3d44f98c8ffa0d191399197007d8459c1453041
-ARG ALPINE_IMAGE=docker.io/library/alpine:3.21.0@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45
+ARG ALPINE_IMAGE=docker.io/library/alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099
 
 # BUILDPLATFORM is an automatic platform ARG enabled by Docker BuildKit.
 # Represents the plataform where the build is happening, do not mix with

Dockerfile.rthooks

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 ARG GOLANG_IMAGE=docker.io/library/golang:1.23.4@sha256:7ea4c9dcb2b97ff8ee80a67db3d44f98c8ffa0d191399197007d8459c1453041
-ARG BASE_IMAGE=docker.io/library/alpine:3.21.0@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45
+ARG BASE_IMAGE=docker.io/library/alpine:3.21.2@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099
 
 # BUILDPLATFORM is an automatic platform ARG enabled by Docker BuildKit.
 # Represents the plataform where the build is happening, do not mix with