Remove tsc

package.json

@@ -37,7 +37,6 @@
     "@types/safe-compare": "^1.1.0",
     "koa": "^2.5.0",
     "node-fetch": "^2.6.0",
-    "tsc": "^1.20150623.0",
     "typescript": "^4.0.2"
   },
   "sideEffects": false,

yarn.lock

@@ -585,11 +585,6 @@ toidentifier@1.0.0:
   resolved "https://registry.yarnpkg.com/toidentifier/-/toidentifier-1.0.0.tgz#7e1be3470f1e77948bc43d94a3c8f4d7752ba553"
   integrity sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==
 
-tsc@^1.20150623.0:
-  version "1.20150623.0"
-  resolved "https://registry.yarnpkg.com/tsc/-/tsc-1.20150623.0.tgz#4ebc3c774e169148cbc768a7342533f082c7a6e5"
-  integrity sha1-Trw8d04WkUjLx2inNCUz8ILHpuU=
-
 tslib@^1.9.3:
   version "1.13.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.13.0.tgz#c881e13cc7015894ed914862d276436fa9a47043"