feat(balance): update max survival skill from foraging

[RoyalFox2140]

Checklist

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• I wrote the PR title in conventional commit format.
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Purpose of change

In an effort to encourage skill training without grinding crafting recipes, I have discovered that foraging bushes is capped by your int score. The current formula seems to be Intelligence divided by 3, plus 1. That means at 12 intelligence you can gain 4 survival from foraging. That's kinda bad as you can grind recipes to level 6 thanks to flint and steel being mainlined. Additionally a 4 int character can only go to level 2.

Describe the solution

The formula is set to intelligence divided by 2 plus one. That means at intelligence 12 you can go to 7, and at int 4 you can go to 3. This also means at level 8 intelligence you can go to level 5, which is around the baseline.

This should allow you to gain more survival without being stuck in a bunker doing crafting, and we can tweak it to be more favorable if that's desired.

Describe alternatives you've considered

Remove the cap by setting it to int divided by 1 + 1, or use int divided by 2 + 2 so it can be respectively at 4, 6, and 8 skill cap. Something for @chaosvolt to consider.

Testing

Tests, because I changed one number on a formula, and I already observed that currently 40 int lets you go to 10 survival.

Additional context

Watch the tests fail because of this. Just watch.

[chaosvolt]

Seems acceptable to me.