Document the deprecation warnings added by commit 5845c218 (Deprecate compatibility with CMake versions older than 2.8.12, 2020-06-12, v3.19.0-rc1~629^2) and commit 3a479154 (Deprecate compatibility with CMake versions older than 3.5, 2023-02-09, v3.27.0-rc1~508^2). Fixes: #25196
Document the deprecation warnings added by commit 5845c218 (Deprecate compatibility with CMake versions older than 2.8.12, 2020-06-12, v3.19.0-rc1~629^2) and commit 3a479154 (Deprecate compatibility with CMake versions older than 3.5, 2023-02-09, v3.27.0-rc1~508^2). Fixes: #25196