Set minimal rustc version

[ikrivosheev]

PR Info

Adds

• Set min rustc version in Cargo.toml, context: Version 0.25.0 not found sea-query#339

Fixes

cargo install sea-orm-cli
    Updating crates.io index
  Installing sea-orm-cli v0.9.1
error: failed to compile sea-orm-cli v0.9.1, intermediate artifacts can be found at /tmp/cargo-installR8Kg4Y

Caused by:
  failed to select a version for the requirement sea-query = "^0.26.0"
  candidate versions found which didn't match: 0.24.6, 0.24.5, 0.24.4, ...
  location searched: crates.io index
  required by package sea-orm-codegen v0.9.0
      ... which satisfies dependency sea-orm-codegen = "^0.9.0" of package sea-orm-cli v0.9.1

Breaking Changes

• Min rust version is 1.60

[tyt2y3]

Thanks!