misp-workbench - [beta-1.6] export bugfixes, bump deps

What's Changed

• fix: exports misp format, remove uuids, set distribution level by @righel in #347
• fix: export first_seen, last_seen in ISO format, drop null attributes by @righel in #348
• build(deps): bump pyjwt from 2.12.1 to 2.13.0 in /api by @dependabot[bot] in #351
• build(deps): bump esbuild, @vitejs/plugin-vue and vite in /frontend by @dependabot[bot] in #350

Full Changelog: beta-1.5...beta-1.6