Removes mongodb:3.6 requirement, adds python36:3.6 and swig:3.0

- mongodb:3.6 is not required to build the module anymore.
  - swig:3.0 is required for the scipy package.
  - python36:3.6 is required for all module packages.

SOURCES/modulemd.src.txt

@@ -18,7 +18,8 @@ data:
     - MIT
   dependencies:
   - buildrequires:
-      mongodb: [3.6]
+      python36: [3.6]
+      swig: [3.0]
       platform: [el8]
     requires:
       platform: [el8]