How to fix unstable build on buildfarm for noetic because of CMP0048?

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I have just released my package on Neotic and the buildfarm reports an unstable build on Ndev_* because of CMake warning CMP0048 than means that VERSION is not provided in the project().

From the console output:

16:09:34 CMake Warning (dev) at CMakeLists.txt:2 (project):
16:09:34   Policy CMP0048 is not set: project() command manages VERSION variables.
16:09:34   Run "cmake --help-policy CMP0048" for policy details.  Use the cmake_policy
16:09:34   command to set the policy and suppress this warning.
16:09:34 
16:09:34   The following variable(s) would be set to empty:
16:09:34 
16:09:34     CMAKE_PROJECT_VERSION
16:09:34     CMAKE_PROJECT_VERSION_MAJOR
16:09:34     CMAKE_PROJECT_VERSION_MINOR
16:09:34     CMAKE_PROJECT_VERSION_PATCH
16:09:34 This warning is for project developers.  Use -Wno-dev to suppress it.

I have checked other ROS packages and they don't seem to provide a version in their CMakeLists.txt nor set the CMP0048 policy explicitly.