[bot][skip ci] Update Metadata

Author: Github Actions

CHANGELOG.md

@@ -1,6 +1,10 @@
-## v2.6.6
+## v2.6.7-pre.1 (prerelease)
 
-No significant changes detected since v2.6.6.
+Changes since v2.6.6:
+
+- Exercise StringBuilder paths that actually reach TryFormat ([@copilot-swe-agent[bot]](https://github.com/copilot-swe-agent[bot]))
+- Throw OverflowException from TryFormat when no string can hold the text ([@copilot-swe-agent[bot]](https://github.com/copilot-swe-agent[bot]))
+- Initial plan ([@copilot-swe-agent[bot]](https://github.com/copilot-swe-agent[bot]))
 
 ## v2.6.6 (patch)
 

LATEST_CHANGELOG.md

@@ -1,4 +1,8 @@
-## v2.6.6
+## v2.6.7-pre.1 (prerelease)
 
-No significant changes detected since v2.6.6.
+Changes since v2.6.6:
+
+- Exercise StringBuilder paths that actually reach TryFormat ([@copilot-swe-agent[bot]](https://github.com/copilot-swe-agent[bot]))
+- Throw OverflowException from TryFormat when no string can hold the text ([@copilot-swe-agent[bot]](https://github.com/copilot-swe-agent[bot]))
+- Initial plan ([@copilot-swe-agent[bot]](https://github.com/copilot-swe-agent[bot]))
 

VERSION.md

@@ -1 +1 @@
-2.6.6
+2.6.7-pre.1