chore(deps): Update cft/developer-tools Docker tag to v1.21 (#1246)

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

Author: renovate[bot]

Makefile

@@ -18,7 +18,7 @@
 # Make will use bash instead of sh
 SHELL := /usr/bin/env bash
 
-DOCKER_TAG_VERSION_DEVELOPER_TOOLS := 1.20
+DOCKER_TAG_VERSION_DEVELOPER_TOOLS := 1.21
 DOCKER_IMAGE_DEVELOPER_TOOLS := cft/developer-tools
 REGISTRY_URL := gcr.io/cloud-foundation-cicd
 

build/int.cloudbuild.yaml

@@ -175,4 +175,4 @@ options:
   - 'TF_IN_AUTOMATION=true'
 substitutions:
   _DOCKER_IMAGE_DEVELOPER_TOOLS: 'cft/developer-tools'
-  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.20'
+  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.21'

build/lint.cloudbuild.yaml

@@ -24,7 +24,7 @@ tags:
 - 'lint'
 substitutions:
   _DOCKER_IMAGE_DEVELOPER_TOOLS: 'cft/developer-tools'
-  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.20'
+  _DOCKER_TAG_VERSION_DEVELOPER_TOOLS: '1.21'
 options:
   machineType: 'N1_HIGHCPU_8'
   env: