Update CoPilot instructions and update ADO pipelines (#627)

.azuredevops/pipelines/DirectXTex-GitHub-CMake-Dev17.yml

@@ -73,7 +73,7 @@ variables:
   - name: WIN10_SDK
     value: '10.0.19041.0'
   - name: WIN11_SDK
-    value: '10.0.22000.0'
+    value: '10.0.26100.0'
 
 pool:
   vmImage: windows-2022

.azuredevops/pipelines/DirectXTex-GitHub-CMake.yml

@@ -73,7 +73,7 @@ variables:
   - name: WIN10_SDK
     value: '10.0.19041.0'
   - name: WIN11_SDK
-    value: '10.0.22000.0'
+    value: '10.0.26100.0'
 
 pool:
   vmImage: windows-2022

.azuredevops/pipelines/DirectXTex-GitHub-MinGW.yml

@@ -77,7 +77,7 @@ variables:
   - name: VCPKG_MANIFEST_DIR
     value: '$(Build.SourcesDirectory)/build'
   - name: WIN11_SDK
-    value: '10.0.22000.0'
+    value: '10.0.26100.0'
   - name: BASE_URL
     value: https://github.com/brechtsanders/winlibs_mingw/releases/download
   - name: URL_MINGW32

.azuredevops/pipelines/DirectXTex-OneFuzz.yml

@@ -32,7 +32,7 @@ name: $(Year:yyyy).$(Month).$(DayOfMonth)$(Rev:.r)
 variables:
   Codeql.Enabled: false
   VS_GENERATOR: 'Visual Studio 17 2022'
-  WIN11_SDK: '10.0.22000.0'
+  WIN11_SDK: '10.0.26100.0'
 
 pool:
   vmImage: windows-2022