scripts: pin dependency versions in PEP 723 headers for reproducibility

Pin every declared dependency to the exact version resolved in the
working uv environments (onnx==1.21.0, onnxruntime==1.26.0,
onnx-neural-compressor==1.0, numpy==1.26.4, sympy==1.14.0,
prettytable==3.17.0, psutil==7.2.2, scipy==1.17.1, loguru==0.7.3) so
uv run reproduces the same toolchain instead of pulling whatever is
latest.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

scripts/quantize-fp16.py

@@ -2,9 +2,9 @@
 # /// script
 # requires-python = ">=3.9"
 # dependencies = [
-#     "onnx",
-#     "onnxruntime",
-#     "sympy",  # onnxruntime.transformers.onnx_model imports it at module load
+#     "onnx==1.21.0",
+#     "onnxruntime==1.26.0",
+#     "sympy==1.14.0",  # onnxruntime.transformers.onnx_model imports it at module load
 # ]
 # ///
 """Convert the fp32 Parakeet ONNX pieces to float16, to land under the WASM /

scripts/quantize-int8-smoothquant.py

@@ -2,15 +2,15 @@
 # /// script
 # requires-python = ">=3.11"
 # dependencies = [
-#     "onnx",
-#     "onnxruntime",
-#     "onnx-neural-compressor",
-#     "numpy",
-#     "sympy",
-#     "prettytable",
-#     "psutil",
-#     "scipy",
-#     "loguru",
+#     "onnx==1.21.0",
+#     "onnxruntime==1.26.0",
+#     "onnx-neural-compressor==1.0",
+#     "numpy==1.26.4",
+#     "sympy==1.14.0",
+#     "prettytable==3.17.0",
+#     "psutil==7.2.2",
+#     "scipy==1.17.1",
+#     "loguru==0.7.3",
 # ]
 # ///
 """Export a *better* int8 Parakeet encoder using SmoothQuant static quantization.

scripts/shard-fp32.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # /// script
 # requires-python = ">=3.9"
-# dependencies = ["onnx"]
+# dependencies = ["onnx==1.21.0"]
 # ///
 """Shard the fp32 Parakeet encoder's external weights into <2 GB pieces so the
 fp32 encoder can load on the WASM backend / in-browser.