build: bump clap from 3.2.14 to 3.2.15

Bumps [clap](https://github.com/clap-rs/clap) from 3.2.14 to 3.2.15.
- [Release notes](https://github.com/clap-rs/clap/releases)
- [Changelog](https://github.com/clap-rs/clap/blob/v3.2.15/CHANGELOG.md)
- [Commits](https://github.com/clap-rs/clap/compare/v3.2.14...v3.2.15)

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

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

vhost_user_block/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 
 [dependencies]
 block_util = { path = "../block_util" }
-clap = { version = "3.2.14", features = ["wrap_help","cargo"] }
+clap = { version = "3.2.15", features = ["wrap_help","cargo"] }
 env_logger = "0.9.0"
 epoll = "4.3.1"
 libc = "0.2.126"
@@ -20,4 +20,4 @@ vm-memory = "0.8.0"
 vmm-sys-util = "0.10.0"
 
 [build-dependencies]
-clap = { version = "3.2.14", features = ["cargo"] }
+clap = { version = "3.2.15", features = ["cargo"] }