chore: bump pip in nodejs Dockerfile

[parthea]

Similar to #2158 but for nodejs instead of nodejs_mono_repo

(py31013) partheniou@partheniou-vm-3:~/git/synthtool$ docker run --rm -it --entrypoint /bin/bash test_nodejs
root@afe6237f988b:~# find / -name "pip-*" 2>/dev/null 
/opt/venv/synthtool/lib/python3.13/site-packages/pip-26.0.1.dist-info
/opt/venv/synthtool/bin/pip-install-dependency-groups
/root/.pyenv/test/pip-rehash.bats
/root/.pyenv/pyenv.d/exec/pip-rehash
/root/.pyenv/pyenv.d/exec/pip-rehash.bash
/root/.pyenv/versions/3.13.12/lib/python3.13/site-packages/pip-26.0.1.dist-info

Towards b/483204659
Towards b/483202911

[parthea]

This is ready for review but not merge