bump alpine container to 3.14

[TomasTomecek]

Traceback (most recent call last):
  File "/usr/bin/sen", line 33, in <module>
    sys.exit(load_entry_point('sen==0.7.0', 'console_scripts', 'sen')())
  File "/usr/bin/sen", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/lib/python3.9/importlib/metadata.py", line 86, in load
    module = import_module(match.group('module'))
  File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 850, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/usr/lib/python3.9/site-packages/sen/cli.py", line 27, in <module>
    from sen.tui.init import Application
  File "/usr/lib/python3.9/site-packages/sen/tui/init.py", line 9, in <module>
    from sen.tui.commands.base import Commander, SameThreadPriority
  File "/usr/lib/python3.9/site-packages/sen/tui/commands/__init__.py", line 4, in <module>
    from .backend import RemoveCommand
  File "/usr/lib/python3.9/site-packages/sen/tui/commands/backend.py", line 8, in <module>
    from sen.tui.buffer import LogsBuffer, InspectBuffer, DfBuffer
  File "/usr/lib/python3.9/site-packages/sen/tui/buffer.py", line 3, in <module>
    from sen.docker_backend import DockerContainer, RootImage
  File "/usr/lib/python3.9/site-packages/sen/docker_backend.py", line 13, in <module>
    import docker
  File "/usr/lib/python3.9/site-packages/docker/__init__.py", line 2, in <module>
    from .api import APIClient
  File "/usr/lib/python3.9/site-packages/docker/api/__init__.py", line 2, in <module>
    from .client import APIClient
  File "/usr/lib/python3.9/site-packages/docker/api/client.py", line 6, in <module>
    import requests
ModuleNotFoundError: No module named 'requests'

WIP