skip mcap rosdep key

v4hn · v4hn · commit d281c3b3b2e4 · 2025-08-24T14:22:38.000+02:00
Plotjuggler sets it, but it's an optional dependency and
mcap is not packaged in Debian yet.
diff --git a/rosdep.yaml b/rosdep.yaml
@@ -83,3 +83,7 @@ python-slacker-cli:
 python-tabulate-pip:
   debian:
     - python3-tabulate
+
+# not packaged in debian yet, but also optional in downstream
+mcap_vendor:
+  debian: []
