Missing `pillow` in dependencies

[jamesbraza]

As of https://github.com/threefoldtecharchive/slides2html/tree/97a32f41333916c35348e4598531542e94f32875:

> uv pip install -e . -r requirements.txt
Resolved 21 packages in 294ms
      Built slides2html @ file:///Users/jamesbraza/code/slides2html
Prepared 1 package in 111ms
Installed 21 packages in 18ms
 + cachetools==5.5.2
 + certifi==2025.8.3
 + chardet==3.0.4
 + click==7.0
 + google-api-python-client==1.7.7
 + google-auth==2.40.3
 + google-auth-httplib2==0.0.4
 + httplib2==0.12.0
 + idna==2.7
 + jinja2==2.10
 + markupsafe==3.0.2
 + oauth2client==4.1.3
 + pyasn1==0.6.1
 + pyasn1-modules==0.4.2
 + requests==2.20.1
 + rsa==4.9.1
 + setuptools==40.6.3
 + six==1.17.0
 + slides2html==1.0.0 (from file:///Users/jamesbraza/code/slides2html)
 + uritemplate==3.0.1
 + urllib3==1.24.3
> slides2html --help
Traceback (most recent call last):
  File "/Users/jamesbraza/code/slides2html/.venv/bin/slides2html", line 3, in <module>
    from slides2html.tool import cli
  File "/Users/jamesbraza/code/slides2html/slides2html/tool.py", line 11, in <module>
    from slides2html.image_utils import images_to_transparent_background, set_background_for_images, resize_images
  File "/Users/jamesbraza/code/slides2html/slides2html/image_utils.py", line 4, in <module>
    from PIL import Image
ModuleNotFoundError: No module named 'PIL'

[jamesbraza]

To get slides2html running with Python 3.12.8, I had to:

1. requirements.txt: unpin Jinja2, requests, google_api_python_client, httplib2
2. Run uv pip install -e . -r requirements.txt pillow six "urllib3>2"

This brings me to:

Package                  Version  Editable project location
------------------------ -------- ----------------------------------
cachetools               5.5.2
certifi                  2025.8.3
cfgv                     3.4.0
charset-normalizer       3.4.3
click                    7.0
distlib                  0.4.0
filelock                 3.19.1
google-api-core          2.25.1
google-api-python-client 2.179.0
google-auth              2.40.3
google-auth-httplib2     0.2.0
googleapis-common-protos 1.70.0
httplib2                 0.22.0
identify                 2.6.13
idna                     3.10
jinja2                   3.1.6
markupsafe               3.0.2
nodeenv                  1.9.1
oauth2client             4.1.3
pillow                   11.3.0
pip                      24.3.1
platformdirs             4.3.8
pre-commit               4.3.0
proto-plus               1.26.1
protobuf                 6.32.0
pyasn1                   0.6.1
pyasn1-modules           0.4.2
pyparsing                3.2.3
pyyaml                   6.0.2
requests                 2.32.5
rsa                      4.9.1
setuptools               40.6.3
six                      1.17.0
slides2html              1.0.0    /Users/jamesbraza/code/slides2html
uritemplate              4.2.0
urllib3                  2.5.0
uv                       0.8.12
virtualenv               20.34.0