Fix IPv6 address key typo in docker_network.present reconnect

[mitar]

docker_network.present looked up "IPV6Address" (uppercase V) in the network-inspect data returned by docker.inspect_network, whose actual key is "IPv6Address" (lowercase v, same casing as the adjacent "IPv4Address" lookup on the previous line). The KeyError was silently swallowed by the surrounding try/except, so on every network recreation the reconnect call dropped the container's ipv6_address argument and Docker auto-assigned a random IPv6 from the pool. Containers with declared static IPv6 addresses would drift off them after any recreate, and subsequent docker_container.running states attempting to reclaim the declared addresses would fail with "403 Address already in use" because the wrong container was still holding them.

Merge requirements satisfied?

[NOTICE] Bug fixes or new features require tests.

• Docs
• Changelog - https://salt-extensions.github.io/salt-extension-copier/topics/documenting/changelog.html#procedure
• Tests written/updated

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[codecov]

Codecov Report

❌ Patch coverage is 64.61538% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.36%. Comparing base (cebd4c0) to head (918dbc1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/unit/states/test_docker_network.py	54.00%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   42.10%   42.36%   +0.25%     
==========================================
  Files          26       27       +1     
  Lines        6545     6610      +65     
  Branches     1138     1138              
==========================================
+ Hits         2756     2800      +44     
- Misses       3542     3563      +21     
  Partials      247      247              

Flag	Coverage Δ
Linux	42.34% <64.61%> (+0.25%)	⬆️
project	37.71% <ø> (ø)
py310	42.29% <64.61%> (+0.25%)	⬆️
py311	42.29% <64.61%> (+0.25%)	⬆️
py314	42.29% <64.61%> (+0.25%)	⬆️
salt_3006_27	42.29% <64.61%> (+0.25%)	⬆️
salt_3008_2	42.29% <64.61%> (+0.25%)	⬆️
tests	50.85% <64.61%> (+0.48%)	⬆️

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