Silence TS 6.0 baseUrl deprecation triggered by tsup's dts build

tsup 8.5.1 unconditionally injects `baseUrl: "."` into its rollup-plugin-dts
invocation, which trips TS5101 under TypeScript 6.0. There's no upstream fix
yet, so opt into TypeScript's own escape hatch until tsup catches up.

Author: nvie

tsconfig.json

@@ -11,7 +11,10 @@
     "paths": {
       "~": ["./src"],
       "~/*": ["./src/*"]
-    }
+    },
+
+    // NOTE Only temporarily needed, until https://github.com/egoist/tsup/pull/1390 gets merged
+    "ignoreDeprecations": "6.0"
   },
   "include": ["src", "test"]
 }