py(deps): gp-sphinx 0.0.1a5 -> 0.0.1a6

why: Align dev docs dependencies with gp-sphinx 0.0.1a6 on PyPI.
what:
- Bump gp-sphinx ecosystem pins in pyproject.toml
- Regenerate uv.lock

Author: tony

pyproject.toml

@@ -59,9 +59,9 @@ dev = [
   # Docs
   "aafigure",
   "pillow",
-  "gp-sphinx==0.0.1a5",
-  "sphinx-argparse-neo==0.0.1a5",
-  "sphinx-autodoc-api-style==0.0.1a5",
+  "gp-sphinx==0.0.1a6",
+  "sphinx-argparse-neo==0.0.1a6",
+  "sphinx-autodoc-api-style==0.0.1a6",
   "gp-libs",
   "sphinx-autobuild",
   # Testing
@@ -85,9 +85,9 @@ dev = [
 docs = [
   "aafigure",
   "pillow",
-  "gp-sphinx==0.0.1a5",
-  "sphinx-argparse-neo==0.0.1a5",
-  "sphinx-autodoc-api-style==0.0.1a5",
+  "gp-sphinx==0.0.1a6",
+  "sphinx-argparse-neo==0.0.1a6",
+  "sphinx-autodoc-api-style==0.0.1a6",
   "gp-libs",
   "sphinx-autobuild",
 ]