fix(BunFile.slice) fix slice when length is greater than the size

[cirospaciari]

What does this PR do?

Fix: #5080

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

I wrote automated tests

[github-actions]

✅ test failures on linux-x64-baseline have been resolved.

^{#b9047d204ecca156c9f051ba1f33a5e54b5f4df5}

[github-actions]

❌ @cirospaciari 1 files with test failures on linux-x64:

• test/js/web/fetch/fetch-gzip.test.ts

View test output

^{#b9047d204ecca156c9f051ba1f33a5e54b5f4df5}

[github-actions]

❌ @cirospaciari 5 files with test failures on bun-darwin-aarch64:

• test/bundler/esbuild/default.test.ts
• test/js/bun/spawn/spawn.test.ts
• test/js/bun/stream/direct-readable-stream.test.tsx
• test/js/bun/test/test-test.test.ts
• test/js/node/watch/fs.watch.test.ts

View test output

^{#b9047d204ecca156c9f051ba1f33a5e54b5f4df5}

[github-actions]

❌ @cirospaciari 6 files with test failures on bun-darwin-x64-baseline:

• test/cli/install/bun-install.test.ts
• test/js/bun/sqlite/sqlite.test.js
• test/js/node/fs/fs.test.ts
• test/js/node/watch/fs.watchFile.test.ts
• test/js/third_party/webpack/webpack.test.ts
• test/js/web/timers/setTimeout.test.js

View test output

^{#b9047d204ecca156c9f051ba1f33a5e54b5f4df5}