Update RoslynCopilot url to 18.0.898-alpha (#8696)

Author: dibarbet

package.json

@@ -405,7 +405,7 @@
     {
       "id": "RoslynCopilot",
       "description": "Language server for Roslyn Copilot integration",
-      "url": "https://roslyn.blob.core.windows.net/releases/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer-18.0.797-alpha.zip",
+      "url": "https://roslyn.blob.core.windows.net/releases/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer-18.0.898-alpha.zip",
       "installPath": ".roslynCopilot",
       "platforms": [
         "neutral"
@@ -414,7 +414,7 @@
         "neutral"
       ],
       "installTestPath": "./.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll",
-      "integrity": "168DC3B3757B5F58DD35E27820949CA8AF4B890BE92D1A0CA6461A3A62E9D0A4"
+      "integrity": "44FC523F2B3FA451327147C53E2FA0D7BA2C438B1A901EAEC32E004FBFA731B4"
     },
     {
       "id": "Debugger",