Upgrade CI to use Git v2.29.0

Gitaly is moving to mandatory Git v2.29.0. This commit upgrades GitLab's
CI to use test against that version.

.gitlab-ci.yml

@@ -17,7 +17,7 @@ stages:
 # in cases where jobs require Docker-in-Docker, the job
 # definition must be extended with `.use-docker-in-docker`
 default:
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.28-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-11-graphicsmagick-1.3.34"
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.29-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-11-graphicsmagick-1.3.34"
   tags:
     - gitlab-org
   # All jobs are interruptible by default

.gitlab/ci/frontend.gitlab-ci.yml

@@ -15,7 +15,7 @@
   extends:
     - .frontend-base
     - .assets-compile-cache
-  image: registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-git-2.28-lfs-2.9-node-12.18-yarn-1.22-graphicsmagick-1.3.34
+  image: registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-git-2.29-lfs-2.9-node-12.18-yarn-1.22-graphicsmagick-1.3.34
   variables:
     WEBPACK_VENDOR_DLL: "true"
   stage: prepare

.gitlab/ci/global.gitlab-ci.yml

@@ -71,7 +71,7 @@
     policy: pull
 
 .use-pg11:
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.28-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-11-graphicsmagick-1.3.34"
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.29-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-11-graphicsmagick-1.3.34"
   services:
     - name: postgres:11.6
       command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
@@ -80,7 +80,7 @@
     POSTGRES_HOST_AUTH_METHOD: trust
 
 .use-pg12:
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.28-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-12-graphicsmagick-1.3.34"
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.29-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-12-graphicsmagick-1.3.34"
   services:
     - name: postgres:12
       command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
@@ -89,7 +89,7 @@
     POSTGRES_HOST_AUTH_METHOD: trust
 
 .use-pg11-ee:
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.28-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-11-graphicsmagick-1.3.34"
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.29-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-11-graphicsmagick-1.3.34"
   services:
     - name: postgres:11.6
       command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
@@ -100,7 +100,7 @@
     POSTGRES_HOST_AUTH_METHOD: trust
 
 .use-pg12-ee:
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.28-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-12-graphicsmagick-1.3.34"
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2-golang-1.14-git-2.29-lfs-2.9-chrome-85-node-12.18-yarn-1.22-postgresql-12-graphicsmagick-1.3.34"
   services:
     - name: postgres:12
       command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]