python 2 came to end of its life. so they removed pip from latest kali only pip3 available but you can manually install pip.
Installing with get-pip.py
To install pip, securely 1 download get-pip.py by following this link: get-pip.py. Alternatively, use curl:
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
Then run the following command in the folder where you have downloaded get-pip.py:
python get-pip.py
