meson: rename meson_options.txt

The proper name for the meson options changed to meson.options in Meson
1.1. Since we don't support older versions of Meson anyway, let's just
rename the options-file to the new name.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Eric Engestrom <None>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33445>

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

@@ -55,7 +55,7 @@
         - .gitlab-ci/**/*
         - include/**/*
         - meson.build
-        - meson_options.txt
+        - meson.options
         - build-support/**/*
         - subprojects/**/*
         - .gitattributes