chore: bump rustversion from 1.0.5 to 1.0.6 (#21636)

* chore: bump rustversion from 1.0.5 to 1.0.6

Bumps [rustversion](https://github.com/dtolnay/rustversion) from 1.0.5 to 1.0.6.
- [Release notes](https://github.com/dtolnay/rustversion/releases)
- [Commits](https://github.com/dtolnay/rustversion/compare/1.0.5...1.0.6)

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

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

* [auto-commit] Update all Cargo lock files

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: dependabot-buildkite <dependabot-buildkite@noreply.solana.com>

sdk/Cargo.toml

@@ -63,7 +63,7 @@ pbkdf2 = { version = "0.9.0", default-features = false }
 qstring = "0.7.2"
 rand = { version = "0.7.0", optional = true }
 rand_chacha = { version = "0.2.2", optional = true }
-rustversion = "1.0.5"
+rustversion = "1.0.6"
 serde = "1.0.130"
 serde_bytes = "0.11"
 serde_derive = "1.0.103"