aya/test/integration-test
Michal Rostecki 325391892c integration-test: Remove multimap C test
libbpf 1.0 doesn't support multimaps defined in `maps` section, it
supports only BTF maps.

At the same time, we already test multimaps loading with the Rust
example (`integration-ebpf/src/bpf/map_test.rs`), so we can just remove
the failing C test.

Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>
..
src integration-test: Remove multimap C test
Cargo.toml Change from Rust edition 2018 to 2021