nongnu: firefox: Update to 121.0 [security fixes].
Fixes CVE-2023-6135, CVE-2023-6856, CVE-2023-6857, CVE-2023-6858,
CVE-2023-6859, CVE-2023-6860, CVE-2023-6861, CVE-2023-6863,
CVE-2023-6864, CVE-2023-6865, CVE-2023-6866, CVE-2023-6867,
CVE-2023-6868, CVE-2023-6869, CVE-2023-6870, CVE-2023-6871,
CVE-2023-6872, CVE-2023-6873.
Firefox 121.0 uses Wayland now by default when available on Linux:
https://www.mozilla.org/en-US/firefox/121.0/releasenotes/
* nongnu/packages/mozilla.scm (firefox): Update to 121.0.
(firefox/wayland): Remove variable and deprecate the package.
Co-authored-by: Ada Stevenson <adanskana@gmail.com>
Signed-off-by: Jonathan Brielmaier <jonathan.brielmaier@web.de>