Attempt to fix the readthedocs build

.readthedocs.yaml

@@ -3,4 +3,11 @@ version: 2
 build:
   os: "ubuntu-22.04"
   tools:
-    python: "3.10"
+    python: "3.12"
+
+sphinx:
+  configuration: docs/source/conf.py
+
+python:
+  install:
+    - requirements: docs/requirements.txt

docs/Makefile

@@ -175,3 +175,6 @@ pseudoxml:
 	$(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
 	@echo
 	@echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml."
+
+pip-compile:
+	pip-compile requirements.in > requirements.txt

docs/requirements.in

@@ -0,0 +1,2 @@
+Sphinx==7.2.6
+sphinx-rtd-theme==1.3.0

docs/requirements.txt

@@ -0,0 +1,62 @@
+#
+# This file is autogenerated by pip-compile with Python 3.12
+# by the following command:
+#
+#    pip-compile requirements.in
+#
+alabaster==0.7.13
+    # via sphinx
+babel==2.13.0
+    # via sphinx
+certifi==2023.7.22
+    # via requests
+charset-normalizer==3.3.0
+    # via requests
+docutils==0.18.1
+    # via
+    #   sphinx
+    #   sphinx-rtd-theme
+idna==3.4
+    # via requests
+imagesize==1.4.1
+    # via sphinx
+jinja2==3.1.2
+    # via sphinx
+markupsafe==2.1.3
+    # via jinja2
+packaging==23.2
+    # via sphinx
+pygments==2.16.1
+    # via sphinx
+requests==2.31.0
+    # via sphinx
+snowballstemmer==2.2.0
+    # via sphinx
+sphinx==7.2.6
+    # via
+    #   -r requirements.in
+    #   sphinx-rtd-theme
+    #   sphinxcontrib-applehelp
+    #   sphinxcontrib-devhelp
+    #   sphinxcontrib-htmlhelp
+    #   sphinxcontrib-jquery
+    #   sphinxcontrib-qthelp
+    #   sphinxcontrib-serializinghtml
+sphinx-rtd-theme==1.3.0
+    # via -r requirements.in
+sphinxcontrib-applehelp==1.0.7
+    # via sphinx
+sphinxcontrib-devhelp==1.0.5
+    # via sphinx
+sphinxcontrib-htmlhelp==2.0.4
+    # via sphinx
+sphinxcontrib-jquery==4.1
+    # via sphinx-rtd-theme
+sphinxcontrib-jsmath==1.0.1
+    # via sphinx
+sphinxcontrib-qthelp==1.0.6
+    # via sphinx
+sphinxcontrib-serializinghtml==1.1.9
+    # via sphinx
+urllib3==2.0.7
+    # via requests

requirements.txt

@@ -10,3 +10,4 @@ tox
 setuptools>=0.16.1
 twine>=3.2
 pip>=20.2.3
+pip-tools