Fix up leftover "state_trackers" references to "frontends"

Fixes: d6287a94b6 "gallium: rename 'state tracker' to 'frontend'"
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11676>

.gitlab-ci/test-source-dep.yml

@@ -66,7 +66,7 @@
       - src/gallium/auxiliary/**/*
       - src/gallium/drivers/*
       - src/gallium/include/**/*
-      - src/gallium/state_trackers/**/*
+      - src/gallium/frontends/**/*
       - src/gallium/targets/**/*
       - src/gallium/tests/**/*
       - src/gallium/winsys/*

REVIEWERS

@@ -52,7 +52,7 @@ HAIKU
 R: Alexander von Gluck IV <kallisti5@unixzen.com>
 F: include/HaikuGL/
 F: src/egl/drivers/haiku/
-F: src/gallium/state_trackers/hgl/
+F: src/gallium/frontends/hgl/
 F: src/gallium/targets/haiku-softpipe/
 F: src/gallium/winsys/sw/hgl/
 F: src/hgl/