[Docs] Fix readthedocs builds

Requires using updated configuration with git unshallow so that version
can be identified from git tags.

Closes: https://github.com/deluge-torrent/deluge/pull/434

.readthedocs.yml

@@ -5,6 +5,14 @@
 # Required
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.10"
+  jobs:
+    post_checkout:
+      - git fetch --unshallow || true
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/source/conf.py
@@ -14,9 +22,8 @@ formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.7
   install:
     - requirements: requirements.txt
     - requirements: docs/requirements.txt
-    - method: setuptools
+    - method: pip
       path: .