build: Bump log from 0.4.17 to 0.4.20

Bumps [log](https://github.com/rust-lang/log) from 0.4.17 to 0.4.20.
- [Release notes](https://github.com/rust-lang/log/releases)
- [Changelog](https://github.com/rust-lang/log/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/log/compare/0.4.17...0.4.20)

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

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

vmm/Cargo.toml

@@ -35,7 +35,7 @@ gdbstub_arch = { version = "0.2.4", optional = true }
 hypervisor = { path = "../hypervisor" }
 libc = "0.2.147"
 linux-loader = { version = "0.10.0", features = ["elf", "bzimage", "pe"] }
-log = "0.4.17"
+log = "0.4.20"
 micro_http = { git = "https://github.com/firecracker-microvm/micro-http", branch = "main" }
 net_util = { path = "../net_util" }
 once_cell = "1.18.0"