[ci] Chasing migrated bot master (#8657)

Author: feisuzhu

.github/workflows/initiator.yaml

@@ -17,7 +17,7 @@ env:
   CI_IMAGE_VERSION: '202304251731'
   # TI_USE_GIT_CACHE: ${{ vars.TI_USE_GIT_CACHE }}
   TI_USE_GIT_CACHE: '1'  # variables are also not populated on forked PRs
-  REDIS_HOST: 172.16.5.1
+  REDIS_HOST: botmaster.tgr
 
 jobs:
   show_environ:

.github/workflows/testing.yml

@@ -605,7 +605,7 @@ jobs:
   #     packages: read
   #     contents: read
   #   env:
-  #     REDIS_HOST: 172.16.5.1
+  #     REDIS_HOST: botmaster.tgr
   #     PY: '3.9'
   #   steps:
   #     - name: Workaround checkout Needed single revision issue
@@ -684,7 +684,7 @@ jobs:
   #     packages: read
   #     contents: read
   #   env:
-  #     REDIS_HOST: 172.16.5.1
+  #     REDIS_HOST: botmaster.tgr
   #     PY: '3.9'
   #   steps:
   #     - name: Workaround checkout Needed single revision issue
@@ -762,7 +762,7 @@ jobs:
   #     packages: read
   #     contents: read
   #   env:
-  #     REDIS_HOST: 172.16.5.1
+  #     REDIS_HOST: botmaster.tgr
   #     PY: '3.9'
   #   steps:
   #     - name: Workaround checkout Needed single revision issue