Update git submodules

* Update frameworks/support from branch 'androidx-master-dev'
  to 30f517c54acc7745a4b1089961f5382fe4b5873c
  - Merge "remove experimental scan operator usage from cachedIn" into androidx-master-dev
  - remove experimental scan operator usage from cachedIn
    
    We were using it just to access the previous value.
    Instead, now we keep it in a variable in scope ¯\_(ツ)_/¯
    
    Bug: 171708323
    Test: existing tests
    Change-Id: I254fd4a1fcdea01c6bd711e8fe2b3ed773a943e4