message: build: point to latest commit on the master branch
  The version-1.4.0 branch no-longer exists, and will be branched off
  master again shortly.
diff: @@ -239,7 +239,7 @@ SOURCE_DATE_EPOCH="${SOURCE_DATE_EPOCH:-$(git -c log.showSignature=false log --f
  time-machine() {
  # shellcheck disable=SC2086
  guix time-machine --url=https://git.savannah.gnu.org/git/guix.git \
  - --commit=6ba510d76d6847065be725e958718002f3b13c7a \
  + --commit=1ef7a03a148cf5f83ab1820444f6bd50d8e732d1 \
  --cores="$JOBS" \
  --keep-failed \
  --fallback \
  