guix: Update various check_tools lists

contrib/guix/guix-attest

@@ -18,7 +18,7 @@ source "$(dirname "${BASH_SOURCE[0]}")/libexec/prelude.bash"
 # Required non-builtin commands should be invokable
 ################
 
-check_tools cat env basename mkdir xargs find
+check_tools cat env basename mkdir diff sort
 if [ -z "$NO_SIGN" ]; then
     check_tools gpg
 fi

contrib/guix/guix-build

@@ -18,7 +18,7 @@ source "$(dirname "${BASH_SOURCE[0]}")/libexec/prelude.bash"
 # Required non-builtin commands should be invocable
 ################
 
-check_tools cat mkdir make getent git guix
+check_tools cat mkdir make getent curl git guix
 
 ################
 # GUIX_BUILD_OPTIONS should be empty