build(deps): bump chrono from 0.4.13 to 0.4.15

Bumps [chrono](https://github.com/chronotope/chrono) from 0.4.13 to 0.4.15.
- [Release notes](https://github.com/chronotope/chrono/releases)
- [Changelog](https://github.com/chronotope/chrono/blob/main/CHANGELOG.md)
- [Commits](https://github.com/chronotope/chrono/compare/v0.4.13...v0.4.15)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.lock

@@ -173,9 +173,9 @@ checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
 [[package]]
 name = "chrono"
-version = "0.4.13"
+version = "0.4.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c74d84029116787153e02106bf53e66828452a4b325cc8652b788b5967c0a0b6"
+checksum = "942f72db697d8767c22d46a598e01f2d3b475501ea43d0db4f16d90259182d0b"
 dependencies = [
  "num-integer",
  "num-traits",