fix: bump nan to 2.27 for Node 26 V8 API support

nan 2.25 still calls SetAlignedPointerInInternalField /
GetAlignedPointerFromInternalField with the old (index, value)
signature. V8 in Node 26 made the EmbedderDataTypeTag argument
mandatory, so the addon failed to compile against Node 26 headers
with "too few arguments to function call, expected 3, have 2".

nan 2.27 ships the updated shims. Verified locally that both
24.15.0 and 26.1.0 prebuilds now build cleanly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: rubnogueira

package-lock.json

@@ -35,7 +35,7 @@
     "benchmark": "node ./benchmark.js"
   },
   "dependencies": {
-    "nan": "^2.25.0",
+    "nan": "^2.27.0",
     "node-gyp": "^12.2.0",
     "prebuild-install": "^7.1.3"
   },