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>

vmm/Cargo.toml

@@ -17,7 +17,7 @@ tdx = ["arch/tdx", "hypervisor/tdx"]
 [dependencies]
 acpi_tables = { path = "../acpi_tables", optional = true }
 anyhow = "1.0.44"
-arc-swap = "1.3.2"
+arc-swap = "1.4.0"
 arch = { path = "../arch" }
 bitflags = "1.3.2"
 block_util = { path = "../block_util" }