docs: modernixe read-the-docs

Signed-off-by: Jan Kowalleck <jan.kowalleck@gmail.com>

.readthedocs.yaml

@@ -1,22 +1,3 @@
-# encoding: utf-8
-
-# This file is part of py-serializable
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-# SPDX-License-Identifier: Apache-2.0
-# Copyright (c) Paul Horton. All Rights Reserved.
-
 # Read the Docs configuration file
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 
@@ -25,9 +6,9 @@ version: 2
 
 # Set the version of Python and other tools you might need
 build:
-  os: ubuntu-20.04
+  os: ubuntu-22.04
   tools:
-    python: "3.10"
+    python: "3.11"
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:

docs/requirements.txt

@@ -1,21 +1,5 @@
-# This file is part of py-serializable
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-# SPDX-License-Identifier: Apache-2.0
-# Copyright (c) Paul Horton. All Rights Reserved.
 
 m2r2>=0.3.2
-Sphinx>=4.3.2
-sphinx-autoapi>=1.8.4
-sphinx-rtd-theme>=1.0.0
+sphinx>=7.2.6,<8
+sphinx-autoapi>=3.0.0,<4
+sphinx-rtd-theme>=2.0.0,<3