WORKSPACE: bump linux-firmware to 20230310

Updates our old linux-firmware to include newer firmware, especially
newer microcode which is relevant for us.

Verified GPG signature for SHA256 hash against key
4CDE8575E547BF835FE15807A31B6BD72486CFD6

Change-Id: I73a63ba7f586e686f5c16960a4f3eb2b514022a5
Reviewed-on: https://review.monogon.dev/c/monogon/+/1409
Reviewed-by: Leopold Schabel <leo@monogon.tech>
Tested-by: Jenkins CI
diff --git a/WORKSPACE b/WORKSPACE
index d7833e0..17d438b 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -136,7 +136,7 @@
 
 linux_firmware_external(
     name = "linux-firmware",
-    version = "20211216",
+    version = "20230310",
 )
 
 load("//third_party/intel_ucode:external.bzl", "intel_ucode_external")