Try a change.

Author: sean-mcmanus

Extension/package.json

@@ -6590,7 +6590,7 @@
         "xml2js": "^0.6.2"
     },
     "dependencies": {
-        "@github/copilot-language-server": "^1.266.0",
+        "@github/copilot-language-server": "^1.273.0",
         "@vscode/extension-telemetry": "^0.9.6",
         "chokidar": "^3.6.0",
         "comment-json": "^4.2.3",
@@ -6613,7 +6613,7 @@
         "which": "^2.0.2"
     },
     "resolutions": {
-        "postcss": "^8.4.31",
+        "postcss": "^8.5.3",
         "gulp-typescript/**/glob-parent": "^5.1.2"
     }
 }

Extension/yarn.lock

@@ -55,7 +55,7 @@
   resolved "https://pkgs.dev.azure.com/azure-public/VisualCpp/_packaging/cpp_PublicPackages/npm/registry/@eslint/js/-/js-8.57.1.tgz#de633db3ec2ef6a3c89e2f19038063e8a122e2c2"
   integrity sha1-3mM9s+wu9qPIni8ZA4Bj6KEi4sI=
 
-"@github/copilot-language-server@^1.266.0":
+"@github/copilot-language-server@^1.273.0":
   version "1.273.0"
   resolved "https://pkgs.dev.azure.com/azure-public/VisualCpp/_packaging/cpp_PublicPackages/npm/registry/@github/copilot-language-server/-/copilot-language-server-1.273.0.tgz#561094fc0d832acae173c40549cd95d27a648fbc"
   integrity sha1-VhCU/A2DKsrhc8QFSc2V0npkj7w=
@@ -3906,7 +3906,7 @@ possible-typed-array-names@^1.0.0:
   resolved "https://pkgs.dev.azure.com/azure-public/VisualCpp/_packaging/cpp_PublicPackages/npm/registry/possible-typed-array-names/-/possible-typed-array-names-1.1.0.tgz#93e3582bc0e5426586d9d07b79ee40fc841de4ae"
   integrity sha1-k+NYK8DlQmWG2dB7ee5A/IQd5K4=
 
-postcss@^7.0.16, postcss@^8.4.31:
+postcss@^7.0.16, postcss@^8.5.3:
   version "8.5.3"
   resolved "https://pkgs.dev.azure.com/azure-public/VisualCpp/_packaging/cpp_PublicPackages/npm/registry/postcss/-/postcss-8.5.3.tgz#1463b6f1c7fb16fe258736cba29a2de35237eafb"
   integrity sha1-FGO28cf7Fv4lhzbLopot41I36vs=