fix(deps): update docker.io/hashicorp/packer docker tag to v1.15.1 (#422)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -1,5 +1,5 @@
 FROM docker.io/hashicorp/terraform:1.14.8@sha256:42ecfb253183ec823646dd7859c5652039669409b44daa72abf57112e622849a AS terraform
-FROM docker.io/hashicorp/packer:1.15.0@sha256:86963cb93f0989dd6bd58476cc8313c32b7c445359139e9d9ecc3f28f30ce46b AS packer
+FROM docker.io/hashicorp/packer:1.15.1@sha256:90fca7a3609ac34796b90e2f9b6da5b7166af69e156207ec30b83e7da13fb511 AS packer
 FROM docker.io/alpine:3.23.3@sha256:25109184c71bdad752c8312a8623239686a9a2071e8825f20acb8f2198c3f659
 
 LABEL maintainer="simon@lauger.name"