Remove openSUSE 15.5, add openSUSE 16.0

John Thackerrequested to merge
johnthacker/wireshark-containers:opensuse-16.0 into master

openSUSE 16.0 is currently a release candidate, but the Docker tag works now. openSUSE 15.5 has been EOL since December 2024, and no current CI job in the main repo uses it.

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