Replace httpmock with wiremock

[fpierfed]

Replace httpmock with wiremock

Summary

Since httpmock (used in tests) depends on async-std which is unmaintained, better to replace it with wire mock which looks like it is in a better shape.

Test plan

N/A: same as before, just using a different mocking library.

cargo fmt --check
cargo clippy --all-targets --all-features -- -D warnings
cargo test --all-features

Contributor acknowledgement

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