Fix stack v2 portraits link (#7)

- Fix stack v2 portraits link (3aa7eb38d3b5b9e36c0927003a541bf804aae057)


Co-authored-by: Marc Marone <mmarone@users.noreply.huggingface.co>

README.md

@@ -39,7 +39,7 @@ BigCode is an open scientific collaboration working on responsible training of l
   - [The Stack train smol](https://huggingface.co/datasets/bigcode/the-stack-v2-train-smol-ids): The Software Heritage identifiers for the training dataset of StarCoder2 3B and 7B with 600B+ unique tokens.
   - [The Stack train full](https://huggingface.co/datasets/bigcode/the-stack-v2-train-full-ids): The Software Heritage identifiers for the training dataset of StarCoder2 15B with 900B+ unique tokens.
   - [StarCoder2 Search](https://huggingface.co/spaces/bigcode/search-v2): Full-text search code in the pretraining dataset.
-  - [StarCoder2 Membership Test](https://stack-dev.dataportraits.org/): Blazing fast test if code was present in pretraining dataset.
+  - [StarCoder2 Membership Test](https://stack-v2.dataportraits.org/): Blazing fast test if code was present in pretraining dataset.
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