Bump version to 2.5.3.1

changelog.md

 # Changelog for [`stm` package](http://hackage.haskell.org/package/stm)
 
+## 2.5.3.1 *November 2023*
+
+  * Drop unused testcase inadvertently introduced in previous reversion
+
 ## 2.5.3.0 *November 2023*
 
   * Revert array-based reimplementation of `TBQueue` due to [#76](https://github.com/haskell/stm/issues/76)

stm.cabal

 cabal-version:  >=1.10
 name:           stm
-version:        2.5.3.0
+version:        2.5.3.1
 -- don't forget to update changelog.md file!
 
 license:        BSD3