Update flake.nix for v0.34.0

[wesm]

Updates flake.nix version to 0.34.0 for the v0.34.0 release.

[roborev-ci]

roborev: Combined Review (134b491)

Synthesis unavailable. Showing raw review outputs.

Agent: codex | Type: security | Status: failed

Error: Review failed. Check CI logs for details.

Agent: gemini | Type: security | Status: done

This change simply bumps the version number in flake.nix from 0.33.1 to 0.34.0. There are no code logic changes, dependency additions, or modifications
to build steps that would introduce security vulnerabilities.

No issues found.

Agent: codex | Type: default | Status: failed

Error: Review failed. Check CI logs for details.

Agent: gemini | Type: default | Status: done

Summary: Updates the roborev package version in flake.n ix from 0.33.1 to 0.34.0.

Review Findings:
No issues found.