Update SDK version to 14.0 for Kubernetes 1.30

[tg123]

This pull request updates the SDK version to 14.0 for Kubernetes 1.30

Also drop support of net7 (EOL 05/14/2024)

[codecov-commenter]

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1551   +/-   ##
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  Coverage          ?   61.46%           
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  Files             ?      103           
  Lines             ?     3065           
  Branches          ?      637           
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  Hits              ?     1884           
  Misses            ?     1181           
  Partials          ?        0           

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[brendandburns]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, tg123

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