chore(deps): update bundler to v2 for dependabot

[tenthirtyam]

Description

Updates bundler to v2 to support Dependabot.

Ref:

• https://github.com/vmware/govmomi/security/dependabot/27
• https://github.com/vmware/govmomi/security/dependabot/25
• bundler in /gen - Update #985577617 #352

govmomi/gen on  chore(deps)/bundler-v2 [!] via 💎 v3.4.2 via 🐹 v1.24.1 on 🐳 v26.1.3 (rancher-desktop) 
✦ ➜ bundle update                     
Fetching gem metadata from https://rubygems.org/.......
Resolving dependencies...
Using racc 1.8.1 (was 1.7.3)
Using power_assert 2.0.5 (was 0.4.1)
Using yaml 0.4.0 (was 0.2.1)
Fetching mini_portile2 2.8.8 (was 2.8.6)
Using nokogiri 1.18.6 (x86_64-darwin) (was 1.16.5)
Using test-unit 3.6.7 (was 3.2.3)
Installing mini_portile2 2.8.8 (was 2.8.6)
Bundle updated!

[dougm]

Thanks @tenthirtyam

[akutz]

Unfortunately this broke building the image since it is tied to Ruby 2 for legacy reasons. I am trying to figure out if I can finally untangle that mess or if this commit must be reverted.