Merge bitcoin/bitcoin#30730: guix: Bump time machine to 53396a22afc04536ddf75d8f82ad2eafa5082725

60d4398a34 guix: drop GCC 12.4.0 package (fanquake)
5ed1511e50 guix: bump time-machine to 53396a22afc04536ddf75d8f82ad2eafa5082725 (fanquake)

Pull request description:

  Followup to #30511.
  https://git.savannah.gnu.org/cgit/guix.git/commit/?id=9aa38f98cbd41644abe2c43bb4f44f74df642df2 landed.

  Linux headers `6.1.102` -> `6.1.106`

ACKs for top commit:
  hebasto:
    ACK 60d4398a34.
  TheCharlatan:
    ACK 60d4398a34

Tree-SHA512: 6ff4372897e5abb15c28d4607915f777585d54b7a35787ac46f7ddca0d695dc60a7da532d8beb37e2df1de12511220f0dc6428f68d6a4db628de816e2d339914

contrib/guix/libexec/prelude.bash

@@ -51,7 +51,7 @@ fi
 time-machine() {
     # shellcheck disable=SC2086
     guix time-machine --url=https://git.savannah.gnu.org/git/guix.git \
-                      --commit=7bf1d7aeaffba15c4f680f93ae88fbef25427252 \
+                      --commit=53396a22afc04536ddf75d8f82ad2eafa5082725 \
                       --cores="$JOBS" \
                       --keep-failed \
                       --fallback \

contrib/guix/manifest.scm

@@ -91,17 +91,7 @@ chain for " target " development."))
       (home-page (package-home-page xgcc))
       (license (package-license xgcc)))))
 
-(define base-gcc
-  (package
-    (inherit gcc-12) ;; 12.3.0
-    (version "12.4.0")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append "mirror://gnu/gcc/gcc-"
-                                  version "/gcc-" version ".tar.xz"))
-              (sha256
-               (base32
-                "0xcida8l2wykvvzvpcrcn649gj0ijn64gwxbplacpg6c0hk6akvh"))))))
+(define base-gcc gcc-12) ;; 12.4.0
 
 (define base-linux-kernel-headers linux-libre-headers-6.1)