v2.6.0: Update to edition 2021 and set rust-version to 1.58
- Bump `serde` from 1.0.130 to 1.0.133 - Bump `futures` from 0.3.17 to 0.3.19 - Bump `libc` from 0.2.103 to 0.2.113
- Bump `serde` from 1.0.130 to 1.0.133 - Bump `futures` from 0.3.17 to 0.3.19 - Bump `libc` from 0.2.103 to 0.2.113