[PLATFORM-2501] bump versions of all dependencies

Dockerfile

-FROM ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}bitnami/kubectl:1.27 AS kubectl
+FROM ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}bitnami/kubectl:1.28 AS kubectl
 
-FROM ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}amazon/aws-cli:2.11.21
+FROM ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}amazon/aws-cli:2.15.48
 ENTRYPOINT []
 COPY --from=kubectl /opt/bitnami/kubectl/bin/kubectl /usr/local/bin/kubectl
 
 # Install jq & kubeseal
-ENV KUBESEAL_VERSION=0.19.5 \
-    KUBESEAL_CHECKSUM=9f8de35b8272533cc687c909ce717d4340aea23a16a3e422a92a6105f23b835b
+# Sealed Secrets releases: https://github.com/bitnami-labs/sealed-secrets/releases
+ENV KUBESEAL_VERSION=0.26.2 \
+    KUBESEAL_CHECKSUM=9681dd97d245e2cd24af7d2f44c962ddd3e7eb67443f9f8ab3c0633b3b0a15a7
 RUN curl -jksSL -o kubeseal.tgz https://github.com/bitnami-labs/sealed-secrets/releases/download/v${KUBESEAL_VERSION}/kubeseal-${KUBESEAL_VERSION}-linux-amd64.tar.gz && \
     echo "${KUBESEAL_CHECKSUM}  ./kubeseal.tgz" | sha256sum -c - && \
     yum -y install jq tar gzip && \