Update ReadTheDocs settings to v2 to resolve urllib3 issue in linkcheck extension

.readthedocs.yml

@@ -1,4 +1,11 @@
+version: 2
+build:
+  os: ubuntu-22.04
+  tools:
+    python: '3.11'
 python:
-  version: 3.7
+  install:
-  pip_install: true
+    - method: pip
-requirements_file: null
+      path: .
+      extra_requirements:
+        - docs

docs/requirements.txt

@@ -1,3 +0,0 @@
-myst_parser==0.18.1
-sphinx-wagtail-theme==6.0.0
-sphinx-copybutton>=0.5,<1.0