Alliance Time to 5 minutes (#1535)

## Description:

Changes Alliance time to 5 minutes from 10 as per manager meeting

## 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:

Iamlewis

src/core/configuration/DefaultConfig.ts

@@ -520,7 +520,7 @@ export class DefaultConfig implements Config {
     return 30 * 10;
   }
   allianceDuration(): Tick {
-    return 600 * 10; // 10 minutes.
+    return 300 * 10; // 5 minutes.
   }
   temporaryEmbargoDuration(): Tick {
     return 300 * 10; // 5 minutes.