chore(deps): bump pubky from 0.5.4 to 0.6.0

Bumps [pubky](https://github.com/pubky/pubky-core) from 0.5.4 to 0.6.0.
- [Release notes](https://github.com/pubky/pubky-core/releases)
- [Commits](pubky/pubky-core@v0.5.4...v0.6.0)

---
updated-dependencies:
- dependency-name: pubky
  dependency-version: 0.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -36,7 +36,7 @@ web-sys = "0.3.77"
 wasm-bindgen-test = "0.3.50"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
-pubky = "0.5.4"
+pubky = "0.6.0"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 tokio = { version = "1.48.0", features = ["full"] }