Remove sipa's old revoked key from verify-commits

Now that the trusted root is past all commits signed by that key we don't need
it in the trusted-keys list, nor do we need to whitelist those commits in
allow-revsig-commits

contrib/verify-commits/allow-revsig-commits

@@ -1,2 +0,0 @@
-586a29253dabec3ca0f1ccba9091daabd16b8411
-eddaba7b5692288087a926da5733e86b47274e4e