Upgrade KV node v1.2.1

sudo systemctl stop 0gkv

cd $HOME/0g-storage-kv
git stash
git fetch --all --tags
git checkout v1.2.1
git submodule update --init --recursive
cargo build --release

sudo systemctl start 0gkv && \
sudo systemctl status 0gkv

sudo journalctl -u 0gkv -f -o cat