Drop old version of glibc

[n0vad3v]

Using old version of glibc with CentOS 7 image won't compile(https://github.com/webp-sh/webp_server_go/actions/runs/13534405190/job/37823287393), we should drop that support now.

[github-actions]

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ghcr.io/webp-sh/webp_server_go (debian 12.9)
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Total: 0 (HIGH: 0, CRITICAL: 0)