Remove release/6.x references (#7658)

Author: schmittjoseph

.github/dependabot.template.yml

@@ -10,7 +10,6 @@
 #@   return {
 #@     "9": [ "net9.0", "net8.0", "net7.0", "net6.0" ],
 #@     "8": [ "net8.0", "net7.0", "net6.0" ],
-#@     "6": [ "net6.0", "netcoreapp3.1" ]
 #@   }
 #@ end
 
@@ -21,7 +20,6 @@
 #@     struct.encode({"name": "main", "majorVersion": "8"}),
 #@     struct.encode({"name": "feature/9.x", "majorVersion": "9"}),
 #@     struct.encode({"name": "release/8.0", "majorVersion": "8"}),
-#@     struct.encode({"name": "release/6.x", "majorVersion": "6"}),
 #@   ]
 #@ end
 

.github/dependabot.yml

@@ -262,70 +262,3 @@ updates:
       - Microsoft.Extensions.*
       - Microsoft.NETCore.DotNetHost
       - System.Text.Json
-- package-ecosystem: nuget
-  directory: /eng/dependabot/independent
-  schedule:
-    interval: daily
-  target-branch: release/6.x
-  ignore:
-  - dependency-name: Microsoft.Extensions.*
-    update-types:
-    - version-update:semver-major
-  - dependency-name: Microsoft.IdentityModel.*
-    update-types:
-    - version-update:semver-major
-    - version-update:semver-minor
-  - dependency-name: Moq
-  commit-message:
-    prefix: '[release/6.x] '
-  groups:
-    azure-sdk-dependencies:
-      patterns:
-      - Azure.Core
-      - Azure.Identity
-      - Azure.Storage.*
-    identity-dependencies:
-      patterns:
-      - Microsoft.Identity.*
-      - Microsoft.IdentityModel.*
-- package-ecosystem: nuget
-  directory: /eng/dependabot/nuget.org
-  schedule:
-    interval: daily
-  target-branch: release/6.x
-  commit-message:
-    prefix: '[release/6.x] '
-- package-ecosystem: nuget
-  directory: /eng/dependabot/net6.0
-  schedule:
-    interval: daily
-  target-branch: release/6.x
-  ignore:
-  - dependency-name: '*'
-    update-types:
-    - version-update:semver-major
-  commit-message:
-    prefix: '[release/6.x] '
-  groups:
-    runtime-dependencies:
-      patterns:
-      - Microsoft.Extensions.*
-      - Microsoft.NETCore.DotNetHost
-      - System.Text.Json
-- package-ecosystem: nuget
-  directory: /eng/dependabot/netcoreapp3.1
-  schedule:
-    interval: daily
-  target-branch: release/6.x
-  ignore:
-  - dependency-name: '*'
-    update-types:
-    - version-update:semver-major
-  commit-message:
-    prefix: '[release/6.x] '
-  groups:
-    runtime-dependencies:
-      patterns:
-      - Microsoft.Extensions.*
-      - Microsoft.NETCore.DotNetHost
-      - System.Text.Json

.github/workflows/sync-branches.yml

@@ -14,7 +14,7 @@ jobs:
     if: github.repository == 'dotnet/dotnet-monitor'
     strategy:
       matrix:
-        branch: ["release/6.x", "release/8.0"]
+        branch: ["release/8.0"]
     name: 'Sync non-code to ${{ matrix.branch }}'
     runs-on: ubuntu-latest
     permissions: