fix: update setup-codeql-environment Go version default from 1.21 to 1.25

The client/go.mod requires go 1.25.6 but the setup action defaulted to
Go 1.21, causing build failures when npm run build-and-test uses the
action's default Go version.

Agent-Logs-Url: https://github.com/advanced-security/codeql-development-mcp-server/sessions/78e52dbe-a4f9-4a7a-b042-c14ad89421b1

Co-authored-by: data-douser <70299490+data-douser@users.noreply.github.com>

Author: Copilot

.github/actions/setup-codeql-environment/action.yml

@@ -29,7 +29,7 @@ inputs:
   go-version:
     description: 'Go version to install'
     required: false
-    default: '1.21'
+    default: '1.25'
   dotnet-version:
     description: '.NET version to install'
     required: false