pin docs build

.readthedocs.yaml

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+version: 2
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+python:
+  install:
+    - requirements: requirements/docs.txt
+    - method: pip
+      path: .
+sphinx:
+  builder: dirhtml
+  fail_on_warning: true

requirements/docs.in

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+Sphinx
+Pallets-Sphinx-Themes
+sphinx-issues

requirements/docs.txt

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+#
+# This file is autogenerated by pip-compile with Python 3.11
+# by the following command:
+#
+#    pip-compile requirements/docs.in
+#
+alabaster==0.7.13
+    # via sphinx
+babel==2.12.1
+    # via sphinx
+certifi==2023.7.22
+    # via requests
+charset-normalizer==3.2.0
+    # via requests
+docutils==0.20.1
+    # via sphinx
+idna==3.4
+    # via requests
+imagesize==1.4.1
+    # via sphinx
+jinja2==3.1.2
+    # via sphinx
+markupsafe==2.1.3
+    # via jinja2
+packaging==23.1
+    # via
+    #   pallets-sphinx-themes
+    #   sphinx
+pallets-sphinx-themes==2.1.1
+    # via -r requirements/docs.in
+pygments==2.16.1
+    # via sphinx
+requests==2.31.0
+    # via sphinx
+snowballstemmer==2.2.0
+    # via sphinx
+sphinx==7.2.5
+    # via
+    #   -r requirements/docs.in
+    #   pallets-sphinx-themes
+    #   sphinx-issues
+    #   sphinxcontrib-applehelp
+    #   sphinxcontrib-devhelp
+    #   sphinxcontrib-htmlhelp
+    #   sphinxcontrib-qthelp
+    #   sphinxcontrib-serializinghtml
+sphinx-issues==3.0.1
+    # via -r requirements/docs.in
+sphinxcontrib-applehelp==1.0.7
+    # via sphinx
+sphinxcontrib-devhelp==1.0.5
+    # via sphinx
+sphinxcontrib-htmlhelp==2.0.4
+    # via sphinx
+sphinxcontrib-jsmath==1.0.1
+    # via sphinx
+sphinxcontrib-qthelp==1.0.6
+    # via sphinx
+sphinxcontrib-serializinghtml==1.1.9
+    # via sphinx
+urllib3==2.0.4
+    # via requests