build: bump arc-swap from 1.3.2 to 1.4.0

Bumps [arc-swap](https://github.com/vorner/arc-swap) from 1.3.2 to 1.4.0.
- [Release notes](https://github.com/vorner/arc-swap/releases)
- [Changelog](https://github.com/vorner/arc-swap/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vorner/arc-swap/compare/v1.3.2...v1.4.0)

---
updated-dependencies:
- dependency-name: arc-swap
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Cargo.lock

@@ -57,9 +57,9 @@ dependencies = [
 
 [[package]]
 name = "arc-swap"
-version = "1.3.2"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5ab7d9e73059c86c36473f459b52adbd99c3554a4fec492caef460806006f00"
+checksum = "e6df5aef5c5830360ce5218cecb8f018af3438af5686ae945094affc86fdec63"
 
 [[package]]
 name = "arch"