Disable rpminspect's rpmdeps in CI

rpminspect.yaml

@@ -1,3 +1,12 @@
+inspections:
+    # GCC subpackages are inter-dependent but without requesting an explicit
+    # version - which rpmdeps dislikes. We can't fix it easily and it's not
+    # a practical problem anyway. Unfortunately we can't say rpmdeps to ignore
+    # the particular warning and just do the rest, therefore we are switching
+    # rpmdeps off completely. We'll compensate the missing coverage by a new
+    # custom downstream test.
+    rpmdeps: off
+
 badfuncs:
     # GCC doesn't use the "forbidden" functions as such. Just some of its
     # sanitizers can instrument those functions which leads to false