RenovateBot: Update docker Docker tag to v20.10.8

This MR contains the following updates:

Package	Type	Update	Change
docker	service-image	patch	20.10.7-dind -> 20.10.8-dind
docker	image	patch	20.10.7 -> 20.10.8

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This MR has been generated by Renovate Bot.

.gitlab-ci.yml

@@ -25,13 +25,13 @@ cache:
 
 # Runnning E2E Test using docker compose and cypress
 e2e_test:
-  image: docker:20.10.7
+  image: docker:20.10.8
   stage: test
   tags:
     - mat-web-runner
   retry: 2
   services:
-    - docker:20.10.7-dind
+    - docker:20.10.8-dind
   variables:
     DOCKER_TLS_CERTDIR: "/certs"
   before_script:
@@ -82,7 +82,7 @@ build_frontend_with_placeholder_url:
 
 # Publish the container in the registry
 .container-build-template: &container-build-template
-  image: docker:20.10.7
+  image: docker:20.10.8
   tags:
     - mat-web-runner
   cache:
@@ -90,7 +90,7 @@ build_frontend_with_placeholder_url:
     paths:
       - node_modules/
   services:
-    - docker:20.10.7-dind
+    - docker:20.10.8-dind
   variables:
     DOCKER_TLS_CERTDIR: "/certs"
   before_script:
@@ -130,9 +130,9 @@ renovate:
 # Run a sast analysis over the container
 container_sast:
   stage: container_sast
-  image: docker:20.10.7
+  image: docker:20.10.8
   services:
-    - docker:20.10.7-dind
+    - docker:20.10.8-dind
   variables:
     DOCKER_TLS_CERTDIR: "/certs"
   allow_failure: true