Bump chrono from 0.4.21 to 0.4.22 in /backend (#420)

Bumps [chrono](https://github.com/chronotope/chrono) from 0.4.21 to 0.4.22.
- [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/v0.4.21...v0.4.22)

---
updated-dependencies:
- dependency-name: chrono
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/Cargo.lock

@@ -457,9 +457,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.21"
+version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f725f340c3854e3cb3ab736dc21f0cca183303acea3b3ffec30f141503ac8eb"
+checksum = "bfd4d1b31faaa3a89d7934dbded3111da0d2ef28e3ebccdb4f0179f5929d1ef1"
 dependencies = [
  "iana-time-zone",
  "js-sys",
@@ -1510,12 +1510,12 @@ dependencies = [
 
 [[package]]
 name = "iana-time-zone"
-version = "0.1.42"
+version = "0.1.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9512e544c25736b82aebbd2bf739a47c8a1c935dfcc3a6adcde10e35cd3cd468"
+checksum = "808cf7d67cf4a22adc5be66e75ebdf769b3f2ea032041437a7061f97a63dad4b"
 dependencies = [
  "android_system_properties",
- "core-foundation",
+ "core-foundation-sys",
  "js-sys",
  "wasm-bindgen",
  "winapi 0.3.9",