build: Bump zvariant from 5.6.0 to 5.7.0

Bumps [zvariant](https://github.com/dbus2/zbus) from 5.6.0 to 5.7.0.
- [Release notes](https://github.com/dbus2/zbus/releases)
- [Commits](https://github.com/dbus2/zbus/compare/zvariant-5.6.0...zvariant-5.7.0)

---
updated-dependencies:
- dependency-name: zvariant
  dependency-version: 5.7.0
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

Cargo.lock

@@ -2958,9 +2958,9 @@ dependencies = [
 
 [[package]]
 name = "zvariant"
-version = "5.6.0"
+version = "5.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d91b3680bb339216abd84714172b5138a4edac677e641ef17e1d8cb1b3ca6e6f"
+checksum = "999dd3be73c52b1fccd109a4a81e4fcd20fab1d3599c8121b38d04e1419498db"
 dependencies = [
  "endi",
  "enumflags2",
@@ -2972,9 +2972,9 @@ dependencies = [
 
 [[package]]
 name = "zvariant_derive"
-version = "5.6.0"
+version = "5.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a8c68501be459a8dbfffbe5d792acdd23b4959940fc87785fb013b32edbc208"
+checksum = "6643fd0b26a46d226bd90d3f07c1b5321fe9bb7f04673cb37ac6d6883885b68e"
 dependencies = [
  "proc-macro-crate",
  "proc-macro2",