convert : sort print supported models [no ci] (#11179)

This commit sorts the list of supported models when printing them out.

The motivation for this change is to make it easier to find a specific
model in the list of supported models. For example:
```console
$ ./convert_hf_to_gguf.py --print-supported-models
Supported models:
- ArcticForCausalLM
- BaiChuanForCausalLM
- BaichuanForCausalLM
- BertForMaskedLM
- BertModel
- BitnetForCausalLM
- BloomForCausalLM
- BloomModel
- CamembertModel
- ChameleonForCausalLM
- ChameleonForConditionalGeneration
- ChatGLMForConditionalGeneration
- ChatGLMModel
- CodeShellForCausalLM
- Cohere2ForCausalLM
- CohereForCausalLM
- DbrxForCausalLM
- DeciLMForCausalLM
- DeepseekForCausalLM
- DeepseekV2ForCausalLM
- DeepseekV3ForCausalLM
- ExaoneForCausalLM
- FalconForCausalLM
- FalconMambaForCausalLM
- GPT2LMHeadModel
- GPTBigCodeForCausalLM
- GPTNeoXForCausalLM
- GPTRefactForCausalLM
- Gemma2ForCausalLM
- GemmaForCausalLM
- GraniteForCausalLM
- GraniteMoeForCausalLM
- GrokForCausalLM
- InternLM2ForCausalLM
- JAISLMHeadModel
- JinaBertForMaskedLM
- JinaBertModel
- LLaMAForCausalLM
- LlamaForCausalLM
- LlavaStableLMEpochForCausalLM
- MPTForCausalLM
- MT5ForConditionalGeneration
- MambaForCausalLM
- MambaLMHeadModel
- MiniCPM3ForCausalLM
- MiniCPMForCausalLM
- MistralForCausalLM
- MixtralForCausalLM
- NemotronForCausalLM
- NomicBertModel
- OLMoForCausalLM
- Olmo2ForCausalLM
- OlmoForCausalLM
- OlmoeForCausalLM
- OpenELMForCausalLM
- OrionForCausalLM
- Phi3ForCausalLM
- PhiForCausalLM
- PhiMoEForCausalLM
- PlamoForCausalLM
- QWenLMHeadModel
- Qwen2ForCausalLM
- Qwen2MoeForCausalLM
- Qwen2VLForConditionalGeneration
- RWForCausalLM
- RWKV6Qwen2ForCausalLM
- RobertaModel
- Rwkv6ForCausalLM
- StableLMEpochForCausalLM
- StableLmForCausalLM
- Starcoder2ForCausalLM
- T5EncoderModel
- T5ForConditionalGeneration
- T5WithLMHeadModel
- UMT5ForConditionalGeneration
- WavTokenizerDec
- XLMRobertaForSequenceClassification
- XLMRobertaModel
- XverseForCausalLM
```

convert_hf_to_gguf.py

@@ -480,7 +480,7 @@ class Model:
 
     @classmethod
     def print_registered_models(cls):
-        for name in cls._model_classes.keys():
+        for name in sorted(cls._model_classes.keys()):
             logger.error(f"- {name}")
 
     @classmethod