guix: bump time-machine to 3cd1c8769c618cab07181c6a4807792a371f0b2e

contrib/guix/guix-build

@@ -449,6 +449,7 @@ EOF
                                  --keep-failed \
                                  --fallback \
                                  --link-profile \
+                                 --writable-root \
                                  --root="$(profiledir_for_host "${HOST}")" \
                                  ${SUBSTITUTE_URLS:+--substitute-urls="$SUBSTITUTE_URLS"} \
                                  ${ADDITIONAL_GUIX_COMMON_FLAGS} ${ADDITIONAL_GUIX_ENVIRONMENT_FLAGS} \

contrib/guix/libexec/prelude.bash

@@ -51,7 +51,7 @@ fi
 time-machine() {
     # shellcheck disable=SC2086
     guix time-machine --url=https://codeberg.org/guix/guix.git \
-                      --commit=639f79952e51a58b7fbca2a826dcc3df162300c1 \
+                      --commit=3cd1c8769c618cab07181c6a4807792a371f0b2e \
                       --cores="$JOBS" \
                       --keep-failed \
                       --fallback \

contrib/guix/manifest.scm

@@ -3,7 +3,7 @@
              (gnu packages bash)
              (gnu packages bison)
              ((gnu packages build-tools) #:select (meson))
-             ((gnu packages certs) #:select (nss-certs))
+             ((gnu packages nss) #:select (nss-certs))
              ((gnu packages cmake) #:select (cmake-minimal))
              (gnu packages commencement)
              (gnu packages compression)