Version bump to 1.6.15.0

changelog.md

 # Changelog for [`process` package](http://hackage.haskell.org/package/process)
 
-## * unreleased *
+## 1.6.15.0 *August 2022*
 
 * Correct permissions on createPipe on Windows [234](https://github.com/haskell/process/pull/234)
 * Ensure that both ends of pipes on Windows are created in the same mode  [234](https://github.com/haskell/process/pull/234)

process.cabal

 name:          process
-version:       1.6.14.0
+version:       1.6.15.0
 -- NOTE: Don't forget to update ./changelog.md
 license:       BSD3
 license-file:  LICENSE