I've updated both, and even restarted, but the version remains the same. My system doesn't know any newer versions:
I would try to install it with Python dependencies installed.
make clean
pip install --user poetry
python -m poetry install
./configure
python -m poetry run make -j4
The install if it works.
sudo make install
It looks like building CLN didn't require a system protobuf lib since I did not install it but was able to build it, either with @n0nce guide or the above one. The way of installing using Poetry above install the protobuf depedency which required to build cln-grpc.
Adjust the python command accordingly if your default python version is not the same.