fix plugins.feedback_os_release failure on sles-1600

[grooverdan]

just the comment at the beginning of its /etc/os-release is already more than 256 bytes

Was in the bb-11.8-release branch but didn't make it back for some reason.

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[gemini-code-assist]

Code Review

This pull request increases the buffer size of the static distribution character array from 256 to 1024 bytes in plugin/feedback/utils.cc for Linux systems. There are no review comments, and I have no additional feedback to provide.

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