chore(main): release 0.251.0 (#7491)

Author: release-please[bot]

VERSION

@@ -1 +1 @@
-1.81.0
+1.82.0

src/SpannerClient.php

@@ -120,7 +120,7 @@ class SpannerClient
     use LROTrait;
     use ValidateTrait;
 
-    const VERSION = '1.81.0';
+    const VERSION = '1.82.0';
 
     const FULL_CONTROL_SCOPE = 'https://www.googleapis.com/auth/spanner.data';
     const ADMIN_SCOPE = 'https://www.googleapis.com/auth/spanner.admin';