Fix crash with more than 4 cars

What's Changed

• test: give the debug cases and annual integration their own predbat instance by @springfall2008 in #4530
• fix(fox): bump settings cache version to force-refresh fdpwr_max on upgrade by @springfall2008 in #4532
• fix(car): clamp num_cars to supported maximum, exclude suspended Octopus devices by @springfall2008 in #4533

Full Changelog: v8.48.2...v8.48.3