Deactivate M104.

The M104 projects are being turned down because Fuchsia is no longer
releasing using M104.

Bug: 1408472
Change-Id: I7d856fb7f7eeb0215c53d3bbed6ac70def843718
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4178256
Auto-Submit: Garrett Beaty <gbeaty@google.com>
Reviewed-by: Stephanie Kim <kimstephanie@google.com>
Commit-Queue: Garrett Beaty <gbeaty@google.com>
Cr-Commit-Position: refs/heads/main@{#1094595}

infra/config/generated/luci/commit-queue.cfg

@@ -4001,7 +4001,6 @@ config_groups {
       name: "chromium/src"
       ref_regexp: "refs/branch-heads/.*"
       ref_regexp_exclude: "refs/branch-heads/5005"
-      ref_regexp_exclude: "refs/branch-heads/5112"
       ref_regexp_exclude: "refs/branch-heads/5359"
       ref_regexp_exclude: "refs/branch-heads/5414"
       ref_regexp_exclude: "refs/branch-heads/5481"