add trailing zero to version number (#1833)

2.2.1 -> 2.2.1.0

docs/.vuepress/config.ts

@@ -17,7 +17,7 @@ export default defineUserConfig({
         const render = md.renderer.render;
 
         const variables = {
-            currentVersion: '2.2.1',
+            currentVersion: '2.2.1.0',
             dotnetVersion: '8.0',
             zksnacksPublicKeyFingerprint: '6FB3 872B 5D42 292F 5992 0797 8563 4832 8949 861E'
         }