build(deps): Bump atsigncompany/buildimage

Bumps the docker group with 1 update in the /tools/multibuild directory: atsigncompany/buildimage.


Updates `atsigncompany/buildimage` from 3.6.2 to 3.7.0

---
updated-dependencies:
- dependency-name: atsigncompany/buildimage
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: docker
...

Signed-off-by: dependabot[bot] <support@github.com>

tools/multibuild/Dockerfile.package

@@ -1,7 +1,7 @@
 # Dockerfile.package
 # A dockerfile for packaging SSH No Ports releases using docker buildx
 
-FROM atsigncompany/buildimage:3.6.2@sha256:e2c82de70a08829be909402f0d9459fc3a78d0a5ea05e27f5eaad31069ee3ba1 AS build
+FROM atsigncompany/buildimage:3.7.0@sha256:6fa08a2b226ab51ac3ff3ce86e55e8cd1893ed484f451b39e7595f269ddb3d6d AS build
 # Using atsigncompany/buildimage until official dart image has RISC-V support
 # See https://github.com/atsign-company/at_dockerfiles for source and automated builds
 WORKDIR /noports