build: add missing dev dependencies for unit tests (#1004)

# What does this PR do?
Added necessary dependencies to ensure successful execution of unit
tests. Without these, the following command would fail due to missing
imports:

```
uv run pytest -v -k "ollama" \
     --inference-model=llama3.2:3b-instruct-fp16
     llama_stack/providers/tests/inference/test_model_registration.py
```

Signed-off-by: Sébastien Han <seb@redhat.com>

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
Run:

```
ollama run llama3.2:3b-instruct-fp16 --keepalive 2m &
uv run pytest -v -k "ollama" --inference-model=llama3.2:3b-instruct-fp16 llama_stack/providers/tests/inference/test_model_registration.py

```

You can observe that some tests pass while others fail, but the test
runs successfully.

[//]: # (## Documentation)
[//]: # (- [ ] Added a Changelog entry if the change is significant)

Signed-off-by: Sébastien Han <seb@redhat.com>
Co-authored-by: Ashwin Bharambe <ashwin.bharambe@gmail.com>

requirements.txt

@@ -12,7 +12,7 @@ distro==1.9.0
 exceptiongroup==1.2.2 ; python_full_version < '3.11'
 filelock==3.17.0
 fire==0.7.0
-fsspec==2024.12.0
+fsspec==2025.2.0
 h11==0.14.0
 httpcore==1.0.7
 httpx==0.28.1
@@ -23,11 +23,11 @@ jsonschema==4.23.0
 jsonschema-specifications==2024.10.1
 llama-models==0.1.3
 llama-stack-client==0.1.3
-lxml==5.3.0
+lxml==5.3.1
 markdown-it-py==3.0.0
 markupsafe==3.0.2
 mdurl==0.1.2
-numpy==2.2.2
+numpy==2.2.3
 packaging==24.2
 pandas==2.2.3
 pillow==11.1.0
@@ -50,7 +50,7 @@ setuptools==75.8.0
 six==1.17.0
 sniffio==1.3.1
 termcolor==2.5.0
-tiktoken==0.8.0
+tiktoken==0.9.0
 tqdm==4.67.1
 typing-extensions==4.12.2
 tzdata==2025.1