chore(ts): make tsconfig compatible with TypeScript 6

- Add rootDir: ./src so tsc no longer errors with TS5011 demanding it
  be set explicitly alongside outDir.
- Add ignoreDeprecations: 6.0 to silence the TS5101 baseUrl deprecation
  warning until baseUrl is removed in TS 7.

tsconfig.json

@@ -3,7 +3,9 @@
     "target": "esnext",
     "module": "commonjs",
     "baseUrl": "./src",
+    "rootDir": "./src",
     "outDir": "./dist",
+    "ignoreDeprecations": "6.0",
     "removeComments": true,
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,