Update git submodules

* Update frameworks/support from branch 'androidx-main'
  to 86866acfbe8c520390ff7f5b7404b78ac92dd597
  - Merge "Update commons-codec to 1.15" into androidx-main
  - Update commons-codec to 1.15
    
    Also add new signing key for commons-codec.
    
    Bug: 223047250
    Test: ./gradlew bOS
    Change-Id: I2ec21e6ed6738b5afa95b28e0db384f0a7616eac
    

* Update prebuilts/androidx/external from branch 'androidx-main'
  to 565dfde450cf701f3dc496fa8856682520e4de0b
  - Merge "Import commons-codec 1.15" into androidx-main
  - Import commons-codec 1.15
    
    Via import_maven_artifacts.py -n commons-codec:commons-codec:1.15
    
    Bug: 223047250
    Test: n/a
    Change-Id: Ia112c500f320ad782ed1b3da266eeb6c68f634dd