Update dependencies and improve cache handling

[ppenna]

This pull request introduces several improvements focused on cache management and workload package handling. The main changes are a refactor of cache lookup logic to use the Registry API, the addition of logic to ensure interpreter packages are installed for scripted workloads, and a utility method for mapping workload types to package names.

[Copilot]

Pull request overview

This PR updates the nanvix dependency and refactors workload execution and cache handling to rely more on the nanvix::registry::Registry API, including ensuring interpreter packages are installed for scripted workloads.

Changes:

• Add WorkloadType::package_name() and install interpreter packages before running scripted workloads.
• Refactor cache lookup helpers to use Registry methods instead of direct filesystem path checks.
• Bump the nanvix git revision (and update the lockfile accordingly).

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/runtime.rs	Adds workload→package mapping and installs scripted workload dependencies before resolving interpreter binaries.
src/cache.rs	Replaces filesystem cache probing with Registry calls and adds a synchronous cache check via a Tokio runtime.
Cargo.toml	Updates the nanvix git revision.
Cargo.lock	Lockfile refresh for the new nanvix revision and its transitive dependency changes.

Comments suppressed due to low confidence (1)

src/runtime.rs:188

• Calling registry.install(...) inside Runtime::run can make normal execution (and the integration tests that call run) depend on registry availability/network on every invocation. If the intent is only to ensure dependencies exist, consider making this step conditional (e.g., only when the interpreter binary/package is missing) or providing an option/env var to skip/avoid installs in offline/test environments.

        if let Some(package_name) = workload_type.package_name() {
            log::info!("Installing package '{}' and dependencies...", package_name);
            self.registry
                .install(machine_type, deployment_type, package_name, true)
                .await?;
        }

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