chore: bump terraform-docs to v0.18.0

Signed-off-by: Khosrow Moossavi <khos2ow@gmail.com>

Author: khos2ow

.github/templates/README.tpl

@@ -13,7 +13,7 @@ branch.
 
 ## Version
 
-`{{ $version }}` (uses [terraform-docs] v0.17.0, which is supported and tested on Terraform
+`{{ $version }}` (uses [terraform-docs] v0.18.0, which is supported and tested on Terraform
 version 0.11+ and 0.12+ but may work for others.)
 
 {{- if eq $version "main" }}

Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM quay.io/terraform-docs/terraform-docs:edge
+FROM quay.io/terraform-docs/terraform-docs:0.18.0
 
 RUN set -x \
     && apk update \

README.md

@@ -8,7 +8,7 @@ branch.
 
 ## Version
 
-`v1.2.0` (uses [terraform-docs] v0.17.0, which is supported and tested on Terraform
+`v1.2.0` (uses [terraform-docs] v0.18.0, which is supported and tested on Terraform
 version 0.11+ and 0.12+ but may work for others.)
 
 ### Upgrade v0 to v1