Fix outlines task1706: pin transformers and tokenizers versions (#39)

The Dockerfile and runner.sh install transformers and tokenizers without
version pins. transformers>=5.0.0 combined with tokenizers>=0.22 breaks
the test suite in two ways:

1. tokenizers 0.22 turns the BPE.__init__ DeprecationWarning into a hard
   error, causing GPT2Tokenizer initialization to fail.
2. transformers 5.x has a code path in _from_pretrained that calls
   import_protobuf_decode_error() inside an except clause, which raises
   ImportError when protobuf is not installed — even for non-protobuf
   tokenizers like GPT2.

Pin transformers<5 and tokenizers<0.21 in both the Dockerfile and
runner.sh to restore compatibility. Verified locally: both feature 4 and
feature 6 tests pass (9/9 and 11/11) with the pinned versions.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: AlienKevin

dataset/dottxt_ai_outlines_task/task1706/Dockerfile

@@ -26,7 +26,7 @@ ENV LLAMA_CPP_FORCE_CPU=1
 ENV PYTORCH_ENABLE_MPS_FALLBACK=1
 RUN uv pip install --system -e . && \
     uv pip install --system pytest pytest-xdist pytest_mock pytest-asyncio pytest-benchmark pytest-cov && \
-    uv pip install --system torch transformers sentencepiece xgrammar llama-cpp-python==0.3.16 psutil
+    uv pip install --system torch "transformers<5" "tokenizers<0.21" sentencepiece xgrammar llama-cpp-python==0.3.16 psutil
 
 # Copy the runner script
 COPY runner.sh /usr/local/bin/

dataset/dottxt_ai_outlines_task/task1706/runner.sh

@@ -67,7 +67,7 @@ echo "Installing dependencies..."
 uv sync 2>/dev/null || true
 uv pip install --system -e .
 uv pip install --system pytest pytest-xdist pytest_mock pytest-asyncio pytest-benchmark pytest-cov
-uv pip install --system torch transformers sentencepiece xgrammar llama-cpp-python==0.3.16 psutil
+uv pip install --system torch "transformers<5" "tokenizers<0.21" sentencepiece xgrammar llama-cpp-python==0.3.16 psutil
 
 # Run tests with timeout
 echo "Running tests..."