chore(deps): upgrade myst-parser to v5, sphinx <10, swagger-plugin-for-sphinx to v7

- myst-parser: >=4.0.1,<5 → >=5,<6 (v5.0.0 adds Sphinx 9 support, requires Python >=3.11)
- sphinx: >=8.2.3,<9 → >=8.2.3,<10 (opens door to Sphinx 9 on Python >=3.12; stays at 8.x while Python 3.11 is supported)
- swagger-plugin-for-sphinx: >=6.1.0,<7 → >=7,<8 (v7 drops Sphinx 7 support, aligns with Sphinx 8/9)

Validated locally: uv sync resolves cleanly, make docs and make lint both pass.

Closes #388, #416, #483. Supersedes #368 (sphinx v9 upper bound now open; full v9 adoption follows Python 3.11 EOL).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: helmut-hoffer-von-ankershoffen

pyproject.toml

@@ -175,7 +175,7 @@ dev = [
     "furo>=2025.9.25",
     "git-cliff>=2.10.1,<3",
     "mypy>=1.19.0,<2",
-    "myst-parser>=4.0.1,<5",
+    "myst-parser>=5,<6",
     "nox[uv]>=2025.11.12",
     "pip-audit>=2.10.0,<3",
     "pip-licenses @ git+https://github.com/neXenio/pip-licenses.git@master", # https://github.com/raimon49/pip-licenses/pull/224
@@ -197,7 +197,7 @@ dev = [
     "pytest-xdist[psutil]>=3.8.0,<4",
     "ruff>=0.14.8,<1",
     "scalene>=2.0.1,<3",
-    "sphinx>=8.2.3,<9",
+    "sphinx>=8.2.3,<10",
     "sphinx-autobuild>=2025.8.25,<2026",
     "sphinx-click>=6.2.0,<7",
     "sphinx-copybutton>=0.5.2,<1",
@@ -208,7 +208,7 @@ dev = [
     "sphinx-toolbox>=4.1.0,<5",
     "sphinxcontrib.mermaid",  # https://github.com/mgaitan/sphinxcontrib-mermaid
     "sphinxext.opengraph>=0.9.1,<1",
-    "swagger-plugin-for-sphinx>=6.1.0,<7",
+    "swagger-plugin-for-sphinx>=7,<8",
     "tomli>=2.3.0,<3",
     "types-pyyaml>=6.0.12.20250915,<7",
     "types-requests>=2.32.4.20250913,<3",