Disable default features to avoid build issues

```
5 | use self::tesseract_sys::TessBaseAPIInit5;
  |     ^^^^^^^^^^^^^^^^^^^^^----------------
  |     |                    |
  |     |                    help: a similar name exists in the module: `TessBaseAPIInit1`
  |     no `TessBaseAPIInit5` in the root
```

https://github.com/houqp/leptess/actions/runs/7589902627/job/20675452376

This will be because the environment github uses doesn't have the new version of tesseract.

.github/workflows/test.yml

@@ -18,10 +18,10 @@ jobs:
       run: sudo apt-get install libleptonica-dev libtesseract-dev clang tesseract-ocr-eng
     - uses: actions/checkout@v2
     - name: Build
-      run: cargo build --verbose
+      run: cargo build --verbose --no-default-features
     - name: Lint code
-      run: cargo clippy
+      run: cargo clippy --no-default-features
     - name: Run tests
-      run: cargo test --verbose
+      run: cargo test --verbose --no-default-features
     - name: Check formatting
       run: cargo fmt -- --check