Update typescript-eslint monorepo to v6.21.0 (#848)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -44,8 +44,8 @@
     "@types/lodash": "4.14.202",
     "@types/react-router-dom": "5.3.3",
     "@types/victory": "33.1.5",
-    "@typescript-eslint/eslint-plugin": "6.20.0",
-    "@typescript-eslint/parser": "6.20.0",
+    "@typescript-eslint/eslint-plugin": "6.21.0",
+    "@typescript-eslint/parser": "6.21.0",
     "copy-webpack-plugin": "11.0.0",
     "css-loader": "6.10.0",
     "css-minimizer-webpack-plugin": "5.0.1",