Update snaps after bslib style changes

[gadenbuie]

Most changes are the result of rstudio/bslib#998

• 215-bslib-nav
  • margin bottom changed on cards
• 216-quosures
  • could not install DiagrammeR or rlang on macOS R4.0
• 301-bs-themes
  • margin/padding changed in layout_columns()
  • also padding-left in navbar is increased slightly
• 304-bslib-card
  • card styles changed (gap, shadow, outline)
• 305-bslib-value-box
  • value box styles changed (gap, shadow, outline)
• 306-accordion-add-remove
  • no visual change?
• 308-sidebar-kitchen-sink
  • card styles changed (gap, shadow, outline)
• 310-bslib-sidebar-dynamic
  • gap changed inside sidebar, margin-bottom in main area
• 313-bslib-card-tab-focus
  • gap changed inside cards