docs: update tox -e docs/RTD from Python 3.13 to 3.14

.readthedocs.yaml

@@ -17,7 +17,7 @@ build:
   os: ubuntu-24.04
   tools:
     python: >-
-      3.13
+      3.14
   apt_packages:
     - inkscape
   jobs:

doc/en/conf.py

@@ -94,6 +94,8 @@
     # Undocumented third parties
     ("py:class", "_tracing.TagTracerSub"),
     ("py:class", "warnings.WarningMessage"),
+    # Python 3.14+ exposes the C accelerator module name.
+    ("py:class", "_py_warnings.WarningMessage"),
     # Undocumented type aliases
     ("py:class", "LEGACY_PATH"),
     ("py:class", "_PluggyPlugin"),

tox.ini

@@ -128,7 +128,7 @@ setenv =
 description =
     build the documentation site under \
     `{toxinidir}{/}doc{/}en{/}_build{/}html` with `{basepython}`
-basepython = python3.13 # Sync with .readthedocs.yaml to get errors.
+basepython = python3.14 # Sync with .readthedocs.yaml to get errors.
 usedevelop = True
 deps =
     -r{toxinidir}/doc/en/requirements.txt