Update Dagger yml and README with new latest version number.

Chang-Eric · Dagger Team · commit 401932d4e653 · 2025-07-17T14:44:01.000-07:00
RELNOTES=N/A
PiperOrigin-RevId: 784257562
diff --git a/_config.yml b/_config.yml
@@ -26,7 +26,7 @@ sass:
 
 googleAnalyticsId: G-R5FZ763JXQ
 
-daggerVersion: "2.56.2"
+daggerVersion: "2.57"
 
 plugins:
   - jekyll-redirect-from
