missed the two changelog pointers (#10138) (#10139)

* missed the two changelog pointers

* Apply suggestions from code review

fixup! missed the two changelog pointers

Co-authored-by: ffaf1 <fa-ml@ariis.it>

* squash! and the other two changelogs

---------

Co-authored-by: ffaf1 <fa-ml@ariis.it>
(cherry picked from commit 82cad891)

Co-authored-by: brandon s allbery kf8nh <allbery.b@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Cabal-syntax/ChangeLog.md

-Please see https://github.com/haskell/cabal/blob/master/release-notes/Cabal-3.12.0.0.md
+Please see https://github.com/haskell/cabal/blob/master/release-notes/Cabal-3.12.1.0.md

Cabal/ChangeLog.md

+# 3.12.1.0 [Artem Pelenitsyn](mailto:a.pelenitsyn@gmail.com) June 2024
+* See https://github.com/haskell/cabal/blob/master/release-notes/Cabal-3.12.1.0.md
+
 # 3.12.0.0 [Francesco Ariis](mailto:fa-ml@ariis.it) May 2024
 # 3.12.0.0 [Francesco Ariis](mailto:fa-ml@ariis.it) March 2024
 * See https://github.com/haskell/cabal/blob/master/release-notes/Cabal-3.12.0.0.md

cabal-install-solver/ChangeLog.md

-Please see https://github.com/haskell/cabal/blob/master/release-notes/cabal-install-3.10.3.0.md
+Please see https://github.com/haskell/cabal/blob/master/release-notes/cabal-install-3.12.1.0.md

cabal-install/changelog

 -*-change-log-*-
 
+3.12.1.0 Artem Pelenitsyn <a.pelenitsyn@gmail.com> June 2024
+	* See https://github.com/haskell/cabal/blob/master/release-notes/cabal-install-3.12.1.0.md
+
 3.10.3.0 Hécate <hecate+github@glitchbra.in> January 2024
 	* See https://github.com/haskell/cabal/blob/master/release-notes/cabal-install-3.10.3.0.md