chore: update build version to 1.0.0-alpha.2 (#205)

Author: xiaoyijun

gradle/logto.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-logtoSdk = "1.0.0-alpha.1"
+logtoSdk = "1.0.0-alpha.2"
 
 [libraries]
 logtoSdk-alipay = { module = "io.logto.sdk:alipay", version.ref = "logtoSdk" }