update link (#2281)

Author: jhyuklee

mteb/models/google_models.py

@@ -231,7 +231,7 @@ def encode(
     max_tokens=8192,
     embed_dim=3072,
     license=None,
-    reference="https://developers.googleblog.com/en/",
+    reference="https://developers.googleblog.com/en/gemini-embedding-text-model-now-available-gemini-api/",
     similarity_fn_name="cosine",
     framework=["API"],
     use_instructions=True,