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Looks like you have an https inspecting proxy (probably a firewall) in the path to code.wireshark.org that is substituting the original certificate with it's own, and your git client doesn't trust the self-signed certificate.

You can either:

1. Turn off git certificate checks (not recommended).
2. Add the proxy certificate to the git certificate store, as mentioned here.
3. Use a tarball instead of a git clone. Much harder to track your local changes and update with a new tarball (unless you throw it all in a local git repo).