[beam] branch master updated: Update CHANGES.md to include 2.51.0 section (#28063)

[lostluck]

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The following commit(s) were added to refs/heads/master by this push:
     new c320ea93055 Update CHANGES.md to include 2.51.0 section (#28063)
c320ea93055 is described below

commit c320ea93055b6092a3303638bff9ff81dace7f67
Author: Yi Hu <ya...@google.com>
AuthorDate: Fri Aug 18 14:36:16 2023 -0400

    Update CHANGES.md to include 2.51.0 section (#28063)
---
 CHANGES.md | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/CHANGES.md b/CHANGES.md
index f9f29c3aa90..29b8fb2e0ab 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -53,6 +53,42 @@
 * ([#X](https://github.com/apache/beam/issues/X)).
 -->
 
+# [2.51.0] - Unreleased
+
+## Highlights
+
+* New highly anticipated feature X added to Python SDK 
([#X](https://github.com/apache/beam/issues/X)).
+* New highly anticipated feature Y added to Java SDK 
([#Y](https://github.com/apache/beam/issues/Y)).
+
+## I/Os
+
+* Support for X source added (Java/Python) 
([#X](https://github.com/apache/beam/issues/X)).
+
+## New Features / Improvements
+
+* X feature added (Java/Python) 
([#X](https://github.com/apache/beam/issues/X)).
+
+## Breaking Changes
+
+* X behavior was changed ([#X](https://github.com/apache/beam/issues/X)).
+* Removed fastjson library dependency for Beam SQL. Table property is changed 
to be based on jackson ObjectNode (Java) 
([#24154](https://github.com/apache/beam/issues/24154)).
+
+## Deprecations
+
+* X behavior is deprecated and will be removed in X versions 
([#X](https://github.com/apache/beam/issues/X)).
+
+## Bugfixes
+
+* Fixed X (Java/Python) ([#X](https://github.com/apache/beam/issues/X)).
+
+## Security Fixes
+* Fixed (CVE-YYYY-NNNN)[https://www.cve.org/CVERecord?id=CVE-YYYY-NNNN] 
(Java/Python/Go) ([#X](https://github.com/apache/beam/issues/X)).
+
+## Known Issues
+
+* ([#X](https://github.com/apache/beam/issues/X)).
+
+
 # [2.50.0] - Unreleased
 
 ## Highlights
@@ -91,7 +127,6 @@
 
 * Python SDK: Legacy runner support removed from Dataflow, all pipelines must 
use runner v2.
 * [Python] Dataflow Runner will no longer stage Beam SDK from PyPI in the 
`--staging_location` at pipeline submission. Custom container images that are 
not based on Beam's default image must include Apache Beam 
installation.([#26996](https://github.com/apache/beam/issues/26996))
-* SDK Java Extensions SQL: remove fastjson library, table property is changed 
to ObjectNode which belongs to jackson library. 
([#24154](https://github.com/apache/beam/issues/24154))
 
 ## Deprecations