Update docs requirements.

Author: Julian

docs/requirements.txt

@@ -6,22 +6,16 @@
 #
 alabaster==0.7.13
     # via sphinx
-babel==2.12.1
+babel==2.13.1
     # via sphinx
 beautifulsoup4==4.12.2
     # via furo
 certifi==2023.7.22
     # via requests
-charset-normalizer==3.2.0
+charset-normalizer==3.3.1
     # via requests
-contourpy==1.1.1
-    # via matplotlib
-cycler==0.11.0
-    # via matplotlib
 docutils==0.20.1
     # via sphinx
-fonttools==4.42.1
-    # via matplotlib
 furo==2023.9.10
     # via -r docs/requirements.in
 idna==3.4
@@ -30,38 +24,20 @@ imagesize==1.4.1
     # via sphinx
 jinja2==3.1.2
     # via sphinx
-kiwisolver==1.4.5
-    # via matplotlib
 lxml==4.9.3
     # via sphinx-json-schema-spec
 markupsafe==2.1.3
     # via jinja2
-matplotlib==3.8.0
-    # via sphinxext-opengraph
-numpy==1.26.0
-    # via
-    #   contourpy
-    #   matplotlib
-packaging==23.1
-    # via
-    #   matplotlib
-    #   sphinx
-pillow==10.0.1
-    # via matplotlib
+packaging==23.2
+    # via sphinx
 pyenchant==3.2.2
     # via sphinxcontrib-spelling
 pygments==2.16.1
     # via
     #   furo
     #   sphinx
-pyparsing==3.1.1
-    # via matplotlib
-python-dateutil==2.8.2
-    # via matplotlib
 requests==2.31.0
     # via sphinx
-six==1.16.0
-    # via python-dateutil
 snowballstemmer==2.2.0
     # via sphinx
 soupsieve==2.5
@@ -97,7 +73,7 @@ sphinxcontrib-serializinghtml==1.1.9
     # via sphinx
 sphinxcontrib-spelling==8.0.0
     # via -r docs/requirements.in
-sphinxext-opengraph==0.8.2
+sphinxext-opengraph==0.9.0
     # via -r docs/requirements.in
-urllib3==2.0.5
+urllib3==2.0.7
     # via requests