Bump hashicorp/terraform from 1.5.7 to 1.6.0 in /.devcontainer (#300)

Bumps hashicorp/terraform from 1.5.7 to 1.6.0.

---
updated-dependencies:
- dependency-name: hashicorp/terraform
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.devcontainer/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM hashicorp/terraform:1.5.7 as terraform
+FROM hashicorp/terraform:1.6.0 as terraform
 
 FROM mcr.microsoft.com/devcontainers/python:3.10