gnu: emacs: Update to 29.4. (security fixes)

This fixes an issue where org-mode would run arbitrary shell code on startup.
See <https://lists.gnu.org/archive/html/emacs-devel/2024-06/msg00695.html> for
the release announcement.

* gnu/packages/emacs.scm (emacs-minimal): Update to 29.4.

gnu/packages/emacs.scm

@@ -100,7 +100,7 @@ (define (%emacs-modules build-system)
 (define-public emacs-minimal
   (package
     (name "emacs-minimal")
-    (version "29.3")
+    (version "29.4")
     (replacement emacs-minimal/fixed)
     (source (origin
               (method url-fetch)
@@ -108,7 +108,7 @@ (define-public emacs-minimal
                                   version ".tar.xz"))
               (sha256
                (base32
-                "1822swrk4ifmkd4h9l0h37zifcpa1w3sy3vsgyffsrp6mk9hak63"))
+                "0dd2mh6maa7dc5f49qdzj7bi4hda4wfm1cvvgq560djcz537k2ds"))
               (patches (search-patches "emacs-disable-jit-compilation.patch"
                                        "emacs-exec-path.patch"
                                        "emacs-fix-scheme-indent-function.patch"