gnu: emacs-dimmer: Update to 0.4.2-1-2f915b1.

To build with Emacs28.

* gnu/packages/emacs-xyz.scm (emacs-dimmer): Update to 0.4.2-1-2f915b1.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/emacs-xyz.scm

@@ -27989,19 +27989,21 @@ and it should work well with 256 color terminals.")
     (license license:gpl3+)))
 
 (define-public emacs-dimmer
+  (let ((commit "2f915b100044e09dd647b22085e1696249c4b115")
+        (revision "1"))
     (package
       (name "emacs-dimmer")
-    (version "0.4.2")
+      (version (git-version "0.4.2" revision commit))
       (source
        (origin
          (method git-fetch)
          (uri (git-reference
                (url "https://github.com/gonewest818/dimmer.el")
-             (commit version)))
+               (commit commit)))
          (file-name (git-file-name name version))
          (sha256
           (base32
-         "0dw0qh5hm1x76s5cqxvylvmjgy0jwy11xm258g6kmx6w1k6r1d2l"))))
+           "00y6645zjary1sz7517qy5pjwfm5ipsc46sypmdygin65hbbc8wg"))))
       (build-system emacs-build-system)
       (home-page "https://github.com/gonewest818/dimmer.el")
       (synopsis "Visually highlights the selected buffer in Emacs")
@@ -28010,7 +28012,7 @@ currently active by dimming the faces in the other buffers.  It does this
 nondestructively, and computes the dimmed faces dynamically such that your
 overall color scheme is shown in a muted form without requiring you to define
 what is a \"dim\" version of every face.")
-    (license license:gpl3+)))
+      (license license:gpl3+))))
 
 (define-public emacs-minibuffer-line
   (package