lexicons: fix sh.tangled.{actor.profile,publicKey} schemas

lexicons/actor/profile.json

···
       "key": "literal:self",
       "record": {
         "type": "object",
+        "required": ["bluesky"],
         "properties": {
-        "required": [
-          "bluesky",
-        ],
           "description": {
             "type": "string",
             "description": "Free-form profile description text.",

lexicons/publicKey.json

···
           },
           "name": {
             "type": "string",
-            "format": "string",
             "description": "human-readable name for this key"
           },
           "createdAt": {