Add a changelog entry for PR haskell#11266

This change modifies the output of `cabal path`, and therefore requires
a changelog entry.

Author: sgillespie

changelog.d/pr-11266

@@ -0,0 +1,11 @@
+synopsis: "Add GHC Project Unit ID store to `cabal path` output"
+packages: cabal-install
+prs: #11266
+issues: #10165
+description: {
+
+This addds the GHC Project Unit ID store path to the cabal path output as
+"project-unit-id". The GHC Project Unit ID store path has been used in cabal-install
+since 3.12.1.0.
+
+}