increase MIRV to 35M (#1487)

## Description:

The new MIRV leaves land contiguous making targets much easier to
invade. So increase price to 35M to compensate.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I have read and accepted the CLA aggreement (only required once).

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/core/configuration/DefaultConfig.ts

@@ -435,7 +435,7 @@ export class DefaultConfig implements Config {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
               ? 0n
-              : 25_000_000n,
+              : 35_000_000n,
           territoryBound: false,
         };
       case UnitType.MIRVWarhead: