Update requirements.txt (#72)

doc/sphinx/requirements.txt

@@ -9,7 +9,7 @@
 alabaster==0.7.12
 attrs==21.2.0
 Babel==2.9.1
-breathe==4.18.1
+breathe==4.19.2
 certifi==2023.7.22
 chardet==4.0.0
 docutils==0.16
@@ -18,8 +18,8 @@ imagesize==1.2.0
 Jinja2==3.1.3
 markdown-it-py==2.2.0
 MarkupSafe==2.0.0
-mdit-py-plugins==0.2.8
-myst-parser==0.14.0
+mdit-py-plugins==0.3.0
+myst-parser==0.16.1
 packaging==20.9
 Pygments==2.15.0
 pyparsing==2.4.7
@@ -28,7 +28,7 @@ PyYAML==5.4.1
 requests==2.31.0
 six==1.16.0
 snowballstemmer==2.1.0
-Sphinx==3.0.4
+Sphinx==3.1.0
 sphinx-rtd-theme==0.4.3
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2