Bump `max_position_embeddings` to 8192

also harmonize `layer_norm_eps` with `norm_eps` although the former isn't used

config.json

@@ -23,10 +23,10 @@
   "initializer_cutoff_factor": 2.0,
   "initializer_range": 0.02,
   "intermediate_size": 2624,
-  "layer_norm_eps": 1e-12,
+  "layer_norm_eps": 1e-5,
   "local_attention": 128,
   "local_rope_theta": 10000.0,
-  "max_position_embeddings": 512,
+  "max_position_embeddings": 8192,
   "mlp_bias": false,
   "mlp_dropout": 0.0,
   "model_type": "modernbert",