Add change note.

lcartey · lcartey · commit 14cb4ffd7aaa · 2023-08-16T23:43:09.000+01:00
diff --git a/change_notes/2023-08-16-update-to-2.12.7.md b/change_notes/2023-08-16-update-to-2.12.7.md
@@ -0,0 +1 @@
+ - Updated the supported CodeQL version to `2.12.7`.

Original file line number	Diff line number	Diff line change
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	`1`	+ - Updated the supported CodeQL version to `2.12.7`.