Update version to 1.51.0-SNAPSHOT

Author: otelbot[bot]

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## Version 1.50.0 (2025-09-25)
+
 Note: This release broadly applies some style guidelines across the repository. As a result,
 some classes that were visible might be package/private. Other non-final classes may now
 be final. See

version.gradle.kts

@@ -1,5 +1,5 @@
-val stableVersion = "1.50.0-SNAPSHOT"
-val alphaVersion = "1.50.0-alpha-SNAPSHOT"
+val stableVersion = "1.51.0-SNAPSHOT"
+val alphaVersion = "1.51.0-alpha-SNAPSHOT"
 
 allprojects {
   if (findProperty("otel.stable") != "true") {