MT#55897 RTD: start using the `.readthedocs.yaml`

Beginning from the 25th Sep 2023, usage of the
configuration file v2 is required. This commit
introduces it.

Change-Id: Ib6d154195621e5939e7d0bd2d6ca9ec62e487077

.readthedocs.yaml

@@ -0,0 +1,13 @@
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.10"
+
+sphinx:
+   configuration: docs/conf.py
+
+python:
+   install:
+   - requirements: docs/requirements.txt

docs/requirements.txt

@@ -1,2 +1,2 @@
-myst_parser
-sphinx_rtd_theme>=1.2
+myst-parser==2.0.0
+sphinx-rtd-theme>=1.2