Update dependencies and fix new lint errors

package.json

@@ -31,47 +31,47 @@
     "koa-router": "^9.4.0",
     "koa-static": "^5.0.0",
     "later": "^1.2.0",
-    "mongodb": "^3.6.1",
+    "mongodb": "^3.6.2",
     "parsimmon": "^1.16.0",
     "seedrandom": "^3.0.5",
     "yaml": "^1.10.0"
   },
   "devDependencies": {
-    "@rollup/plugin-commonjs": "^15.0.0",
+    "@rollup/plugin-commonjs": "^15.1.0",
     "@rollup/plugin-json": "^4.1.0",
     "@rollup/plugin-node-resolve": "^9.0.0",
-    "@rollup/plugin-typescript": "^5.0.2",
+    "@rollup/plugin-typescript": "^6.0.0",
     "@types/jsonwebtoken": "^8.5.0",
     "@types/koa": "^2.11.4",
-    "@types/koa-compress": "^4.0.0",
+    "@types/koa-compress": "^4.0.1",
     "@types/koa-router": "^7.4.1",
     "@types/koa-static": "^4.0.1",
-    "@types/mithril": "^2.0.3",
+    "@types/mithril": "^2.0.4",
     "@types/mongodb": "^3.5.27",
-    "@types/parsimmon": "^1.10.2",
+    "@types/parsimmon": "^1.10.3",
     "@types/seedrandom": "^2.4.28",
     "@types/svgo": "^1.3.3",
-    "@typescript-eslint/eslint-plugin": "^3.10.1",
-    "@typescript-eslint/parser": "^3.10.1",
-    "ava": "^3.12.1",
-    "codemirror": "^5.57.0",
+    "@typescript-eslint/eslint-plugin": "^4.3.0",
+    "@typescript-eslint/parser": "^4.3.0",
+    "ava": "^3.13.0",
+    "codemirror": "^5.58.1",
     "cssnano": "^4.1.10",
-    "eslint": "^7.8.0",
-    "eslint-config-prettier": "^6.11.0",
+    "eslint": "^7.10.0",
+    "eslint-config-prettier": "^6.12.0",
     "esm": "^3.2.25",
-    "jsbi": "^3.1.3",
+    "jsbi": "^3.1.4",
     "mithril": "^2.0.4",
-    "postcss": "^7.0.32",
+    "postcss": "^8.1.1",
     "postcss-import": "^12.0.1",
     "postcss-preset-env": "^6.7.0",
-    "prettier": "^2.1.1",
-    "rollup": "^2.26.9",
-    "rollup-plugin-terser": "^7.0.1",
+    "prettier": "^2.1.2",
+    "rollup": "^2.28.2",
+    "rollup-plugin-terser": "^7.0.2",
     "source-map-loader": "^1.1.0",
     "svgo": "^1.3.2",
     "ts-node": "^9.0.0",
-    "typescript": "^4.0.2",
-    "webpack": "^4.44.1"
+    "typescript": "^4.0.3",
+    "webpack": "^4.44.2"
   },
   "engines": {
     "node": ">=12.13.0"