Update git submodules

* Update OAuth from branch 'master'
  to 03670b2329f56a4b1535b2e53c43f17fe6ed39f8
  - Migrate from wikimedia/oauth2-server fork to league/oauth2-server
    
    In order to migrate, we need to re-implement two things:
    
    - Issuer ('iss') claim
      thephpleague/oauth2-server#1138
    
      This is easy: as advised on the pull request, we can just override
      AccessTokenTrait::convertToJWT() to do what we want. In fact, we
      already do this to change some other claims, so to avoid rewriting
      our code, we just need to add the field/setter/getter matching the
      rejected pull request.
    
    - Custom claims
      thephpleague/oauth2-server#1122
    
      This is a bit trickier, since we need to know the grant type
      in order to generate our claims, and we don't know that in
      AccessTokenEntity. I added overrides to do it in the Grant classes
      that we use instead, in the method where the AccessTokenEntity
      is created. Then we add the field/setter/getter and a minimal
      ClaimEntity class matching the stalled pull request.
    
    The licenses of league/oauth2-server and this repository are not
    compatible, so I re-implemented the necessary features and did not
    copy the code.
    
    Depends-On: I37f0e614f088ab962d7064f2c7f763060283adae
    Bug: T261462
    Change-Id: I5e8bcbe46b2d4aa8550beb7731aa2a1a70ecc139

Author: MatmaRex