Update change log for upcoming release (#123)

Author: trask

.github/scripts/get-version.sh

@@ -1,3 +1,3 @@
 #!/bin/bash -e
 
-grep -Eo "var semanticConventionsVersion = \".*\"" build.gradle.kts | grep -Eo "[0-9]+.[0-9]+.[0-9]+"
+grep "var semanticConventionsVersion = " build.gradle.kts | grep -Eo "[0-9]+.[0-9]+.[0-9]+"

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+*  Update to semantic conventions 1.29.0 and weaver 0.12.0
+   ([#118](https://github.com/open-telemetry/semantic-conventions-java/pull/118))
+
 ## Version 1.28.0 (2024-10-14)
 
 * Use weaver for semantic convention codegen