Replace deprecated std::is_pod

[nyllet]

Issue

Fixing issue #6716 by replacing std::is_pod with std::is_standard_layout && std::is_trivial

Tasklist

• [ ] CHANGELOG.md entry (How to write a changelog entry)
• [ ] update relevant Wiki pages
• [ ] add tests (see testing documentation)
• [ ] review
• [ ] adjust for comments
• [ ] cherry pick to release branch