message: Correct the release dates for 1.61 and 1.62
diff: # Changelog
  -## Cargo 1.62 (2022-05-19)
  +## Cargo 1.62 (2022-06-30)
  [1ef1e0a1...HEAD](https://github.com/rust-lang/cargo/compare/1ef1e0a1...HEAD)
  ### Added
  ### Nightly only
  -## Cargo 1.61 (2022-04-07)
  +## Cargo 1.61 (2022-05-19)
  [ea2a21c9...rust-1.61.0](https://github.com/rust-lang/cargo/compare/ea2a21c9...rust-1.61.0)
  ### Added
  