Update biome settings, remove unused imports

Author: steveukx

biome.json

@@ -76,7 +76,7 @@
       }
     },
     {
-      "includes": ["simple-git/src/git.js", "simple-git/scripts/*"],
+      "includes": ["simple-git/src/git.ts", "simple-git/scripts/*"],
       "linter": {
         "rules": {
           "complexity": {

simple-git/test/unit/__fixtures__/child-processes.ts

@@ -1,4 +1,3 @@
-import type { Mock } from 'vitest';
 import { MockChildProcess, mockChildProcessModule } from '../__mocks__/mock-child-process';
 import { wait } from '@simple-git/test-utils';
 

simple-git/test/unit/plugins/plugin.completion-detection.spec.ts

@@ -1,4 +1,4 @@
-import type { Mock } from 'vitest';
+import { describe, it, expect } from 'vitest';
 import { newSimpleGit, theChildProcessMatching, wait } from '../__fixtures__';
 import { MockChildProcess } from '../__mocks__/mock-child-process';