fix(ci): use --no-sync in no-pysam job to prevent re-installing pysam

uv run without --no-sync re-syncs the environment with default groups,
which includes the pysam group. Add --no-sync to all uv run commands in
the Tests-without-pysam job so the environment stays as uv sync set it up.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: msto

.github/workflows/tests.yml

@@ -71,11 +71,11 @@ jobs:
 
       - name: Verify pysam is not installed
         run: |
-          uv run python -c "import pysam" 2>&1 && exit 1 || echo "pysam correctly not installed"
+          uv run --no-sync python -c "import pysam" 2>&1 && exit 1 || echo "pysam correctly not installed"
 
       - name: Run pysam-independent tests
         run: |
-          uv run pytest \
+          uv run --no-sync pytest \
             tests/fgpyo/test_read_structure.py \
             tests/fgpyo/test_sequence.py \
             tests/fgpyo/test_requirements.py \
@@ -90,4 +90,4 @@ jobs:
 
       - name: Verify pysam-dependent modules are importable
         run: |
-          uv run python -c "from fgpyo.sam import Cigar; print('fgpyo.sam importable without pysam')"
+          uv run --no-sync python -c "from fgpyo.sam import Cigar; print('fgpyo.sam importable without pysam')"