contrib: Remove keys that are no longer used for merging

See:
https://bitcoin-irc.chaincode.com/bitcoin-core-dev/2021-10-21#726591
https://bitcoin-irc.chaincode.com/bitcoin-core-dev/2021-12-09#750000

Also updated trusted-git-root to be right after meshcollider's last
merge.

contrib/verify-commits/trusted-git-root

@@ -1 +1 @@
-82bcf405f6db1d55b684a1f63a4aabad376cdad7
+577bd51a4b8de066466a445192c1c653872657e2

contrib/verify-commits/trusted-keys

@@ -1,8 +1,6 @@
 71A3B16735405025D447E8F274810B012346C9A6
 133EAC179436F14A5CF1B794860FEB804E669320
-32EE5C4C3FA15CCADB46ABE529D4BCB6416F53EC
 B8B3F1C0E58C15DB6A81D30C3648A882F4316B9B
-CA03882CB1FC067B5D3ACFE4D300116E1C875A3D
 E777299FC265DD04793070EB944D35F9AC3DB76A
 D1DBF2C4B96F2DEBF4C16654410108112E7EA81F
 152812300785C96444D3334D17565732E08E5E41