Use the Ledvance OTA image versions to pick only the latest images

[puddly]

Fixes #963

[coveralls]

Coverage decreased (-0.02%) to 99.723% when pulling 5377111 on puddly:puddly/fix-ledvance-ota-version-parsing into 56fae33 on zigpy:dev.

[codecov-commenter]

Codecov Report

Merging #964 (5377111) into dev (56fae33) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #964   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files          45       45           
  Lines        6686     6689    +3     
=======================================
+ Hits         6669     6672    +3     
  Misses         17       17           

Impacted Files	Coverage Δ
zigpy/ota/provider.py	99.68% <100.00%> (+<0.01%)	⬆️

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