Update bridges subtree (#2903)

* Squashed 'bridges/' changes from 0417308a48..3c4ada921b

3c4ada921b Update dependecies (#2277) (#2281)
3e195c9e76 GRANDPA: optimize votes_ancestries when needed (#2262) (#2264)
7065bbabc6 Implement RuntimeDebug for GrandpaJustification (#2254)
8c9e59bcbc Define generate_grandpa_key_ownership_proof() (#2247) (#2248)
0b46956df7 Deduplicate Grandpa consensus log reading logic (#2245) (#2246)
96c9701710 Fix deps from Cumulus (#2244)

git-subtree-dir: bridges
git-subtree-split: 3c4ada921bbdbdba945c3aa85d76ce316f7baab3

* removed extra files

* post-merge fixes

* also post-merge fixes