maint: Replace remaining usages of isc-dhcp with dhcpcd.

isc-dhcp has been unmaintained since 2022.  This is a follow-up to commit
3e713ae41c73b352fad4830b23721ee07935c512.

* doc/guix.texi (Keyboard Layout and Networking and Partitioning): Adjust
example.
* etc/manifests/cross-compile.scm (%system-packages)
* etc/manifests/release-desktop.scm (%desktop-packages)
* etc/manifests/release-minimal.scm (%system-packages): Replace "isc-dhcp"
with "dhcpcd".
* gnu/system.scm (%base-packages-networking): Likewise.
* gnu/tests/install.scm (%simple-installation-script)
(%extlinux-gpt-installation-script)
(%simple-installation-script-for-/dev/vda)
(%separate-store-installation-script)
(%extra-encrypted-packages): Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/gnu/system.scm b/gnu/system.scm
index d2db4ea8f52..14b4cab4b22 100644
--- a/gnu/system.scm
+++ b/gnu/system.scm
@@ -977,7 +977,7 @@ of PROVENANCE-SERVICE-TYPE to its services."
 
 (define %base-packages-networking
   ;; Default set of networking packages.
-  (list inetutils isc-dhcp
+  (list inetutils dhcpcd
         iproute
         wget
         nss-certs