chore: bump version.json to 0.18.0 for v0.18 release

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: csharpfritz

version.json

@@ -1,10 +1,11 @@
 {
   "$schema": "https://raw.githubusercontent.com/dotnet/Nerdbank.GitVersioning/main/src/NerdBank.GitVersioning/version.schema.json",
-  "version": "0.15",
+  "version": "0.18.0",
   "publicReleaseRefSpec": [
     "^refs/heads/master$",
     "^refs/heads/main$",
-    "^refs/heads/v\\d+(?:\\.\\d+)?$"
+    "^refs/heads/v\\d+(?:\\.\\d+)?$",
+    "^refs/tags/v\\d+\\.\\d+(\\.\\d+)?$"
   ],
   "cloudBuild": {
     "buildNumber": {