v3.0.0

Changelog

• 5449cc6 fix(project): remove duplicate template copy in project bootstrap (#372)
• 3e393d9 build(nix): add a nix flake to make runpodctl easy to use with nix (#373)
• 1f31629 refactor!: move runpodctl's registry, volume, billing, template, catalog, ssh key, pod, serverless and legacy commands to rest v2 (#360)
• 355ab8d refactor(api): add rest v2 request helpers to the shared client (#359)
• 71fc89f feat: prompt to update when a newer release exists (#346)
• 0e1ef8b chore(deps): bump go to 1.26.9 and x/net to v0.60.0, and fix the flaky rsync test (#371)