Prepare for 12.0.0-beta.13 release (#7924)

Author: cknitt

CHANGELOG.md

@@ -10,21 +10,13 @@
 > - :nail_care: [Polish]
 > - :house: [Internal]
 
-# 12.0.0-beta.13 (Unreleased)
-
-#### :boom: Breaking Change
-
-#### :eyeglasses: Spec Compliance
-
-#### :rocket: New Feature
+# 12.0.0-beta.13
 
 #### :bug: Bug fix
 
 - Fix result examples. https://github.com/rescript-lang/rescript/pull/7914
 - Make inline record fields that overlap with a variant's tag a compile error. https://github.com/rescript-lang/rescript/pull/7875
 
-#### :memo: Documentation
-
 #### :nail_care: Polish
 
 - Keep track of compiler info during build. https://github.com/rescript-lang/rescript/pull/7889
@@ -34,8 +26,6 @@
 - Rewatch: Traverse upwards for package resolution in single context projects. https://github.com/rescript-lang/rescript/pull/7896
 - Rewatch: Add `--warn-error` flag to `build`. https://github.com/rescript-lang/rescript/pull/7916
 
-#### :house: Internal
-
 # 12.0.0-beta.12
 
 #### :boom: Breaking Change