build(deps): bump the vhost-device group in /staging with 3 updates

Bumps the vhost-device group in /staging with 3 updates: [rstest](https://github.com/la10736/rstest), [proc-macro2](https://github.com/dtolnay/proc-macro2) and [rstest_macros](https://github.com/la10736/rstest).


Updates `rstest` from 0.19.0 to 0.21.0
- [Release notes](https://github.com/la10736/rstest/releases)
- [Changelog](https://github.com/la10736/rstest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/la10736/rstest/compare/v0.19.0...v0.21.0)

Updates `proc-macro2` from 1.0.84 to 1.0.85
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](https://github.com/dtolnay/proc-macro2/compare/1.0.84...1.0.85)

Updates `rstest_macros` from 0.19.0 to 0.21.0
- [Release notes](https://github.com/la10736/rstest/releases)
- [Changelog](https://github.com/la10736/rstest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/la10736/rstest/compare/v0.19.0...v0.21.0)

---
updated-dependencies:
- dependency-name: rstest
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: vhost-device
- dependency-name: proc-macro2
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: vhost-device
- dependency-name: rstest_macros
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: vhost-device
...

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

staging/Cargo.lock

@@ -445,9 +445,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.84"
+version = "1.0.85"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec96c6a92621310b51366f1e28d05ef11489516e93be030060e5fc12024a49d6"
+checksum = "22244ce15aa966053a896d1accb3a6e68469b97c7f33f284b99f0d576879fc23"
 dependencies = [
  "unicode-ident",
 ]
@@ -498,9 +498,9 @@ checksum = "ba39f3699c378cd8970968dcbff9c43159ea4cfbd88d43c00b22f2ef10a435d2"
 
 [[package]]
 name = "rstest"
-version = "0.19.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d5316d2a1479eeef1ea21e7f9ddc67c191d497abc8fc3ba2467857abbb68330"
+checksum = "9afd55a67069d6e434a95161415f5beeada95a01c7b815508a82dcb0e1593682"
 dependencies = [
  "futures",
  "futures-timer",
@@ -510,12 +510,13 @@ dependencies = [
 
 [[package]]
 name = "rstest_macros"
-version = "0.19.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04a9df72cc1f67020b0d63ad9bfe4a323e459ea7eb68e03bd9824db49f9a4c25"
+checksum = "4165dfae59a39dd41d8dec720d3cbfbc71f69744efb480a3920f5d4e0cc6798d"
 dependencies = [
  "cfg-if",
  "glob",
+ "proc-macro-crate",
  "proc-macro2",
  "quote",
  "regex",

staging/vhost-device-video/Cargo.toml

@@ -36,7 +36,7 @@ v4l2r = { git =  "https://github.com/Gnurou/v4l2r", rev = "110fd77", optional =
 
 [dev-dependencies]
 assert_matches = "1.5"
-rstest = "0.19.0"
+rstest = "0.21.0"
 tempfile = "3.10.1"
 virtio-queue = { version = "0.12", features = ["test-utils"] }
 vm-memory = { version = "0.14.1", features = ["backend-mmap", "backend-atomic"] }