Update git submodules

* Update frameworks/support from branch 'androidx-main'
  to 6878296c90b4de42ec94bacc04ae2a4651620054
  - Merge "Start fetching develocity auth keys from google cloud secret manager" into androidx-main
  - Start fetching develocity auth keys from google cloud secret manager
    
    If a user hasn't set up develocity yet set it up for them using a key
    stored in Google cloud secret manager. This will allow us to see
    performance issues for developers on their local machines.
    
    Test: rm -fr ../../out/.gradle/develocity/keys.properties && ./gradlew tasks
    Change-Id: If66ccce9dcbfc4d7378c1e0e62c2f76c891c1367
    

* Update prebuilts/androidx/external from branch 'androidx-main'
  to 9b0105de7bfeaa7d4a7ad3895fcf1bede0379d74
  - Merge "Add Google Cloud Secrets manager library prebuilts" into androidx-main
  - Add Google Cloud Secrets manager library prebuilts
    
    Test: usage in androidx
    Change-Id: I1325efc8e9ef4c5873b546f862972511c122fc9d
    
2 files changed