Resolve uninlined_format_args pedantic clippy lint in test suite
Resolve uninlined_format_args pedantic clippy lint in test suite

    error: variables can be used directly in the `format!` string
        --> test_suite/tests/test_annotations.rs:1238:30
         |
    1238 |     serializer.serialize_str(format!("{};{:?}", f1, f2).as_str())
         |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^
         |
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
         = note: `-D clippy::uninlined-format-args` implied by `-D clippy::pedantic`
    help: change this to
         |
    1238 -     serializer.serialize_str(format!("{};{:?}", f1, f2).as_str())
    1238 +     serializer.serialize_str(format!("{f1};{f2:?}").as_str())
         |

serde-rs/serde