docs: fix build when async_timeout not installed

Since we were importing `bleak` in conf.py, it required some runtime
dependencies to be installed. We can avoid this by just reading the
version from the pyproject.toml file instead.

docs/conf.py

@@ -13,9 +13,14 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+import pathlib
 import sys
 import os
 
+import tomli
+
+PROJECT_ROOT_DIR = pathlib.Path(__file__).parent.parent.resolve()
+
 # If extensions (or modules to document with autodoc) are in another
 # directory, add these directories to sys.path here. If the directory is
 # relative to the documentation root, use os.path.abspath to make it
@@ -31,7 +36,6 @@
 # version is used.
 sys.path.insert(0, project_root)
 
-import bleak
 
 # -- General configuration ---------------------------------------------
 
@@ -61,10 +65,11 @@
 # for |version| and |release|, also used in various other places throughout
 # the built documents.
 #
-# The short X.Y version.
-version = bleak.__version__
 # The full version, including alpha/beta/rc tags.
-release = bleak.__version__
+with open(PROJECT_ROOT_DIR / "pyproject.toml", "rb") as f:
+    release = tomli.load(f)["tool"]["poetry"]["version"]
+# The short X.Y version.
+version = ".".join(release.split(".")[:2])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

docs/requirements.txt

@@ -1,2 +1,3 @@
 Sphinx==5.1.1
 sphinx-rtd-theme==1.0.0
+tomli==2.0.1