getBytes does not validate ivLength, may throw NegativeArraySizeException

### Please agree to the following

- [x] I have searched [existing issues](https://github.com/cryptomator/android/issues?q=) for duplicates
- [x] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/android/blob/develop/.github/CODE_OF_CONDUCT.md)

### Summary

The getBytes method in CryptoByteArrayUtils does not validate the ivLength argument. If ivLength is larger than the input array length, the method will throw a NegativeArraySizeException when creating the result array.

### System Setup

```markdown
- Android: 35 (target SDK)
- Cryptomator: 1.13.0-SNAPSHOT
```

### Cloud Type

_No response_

### Steps to Reproduce

byte[] data = new byte[5];
CryptoByteArrayUtils.getBytes(data, 10);

### Expected Behavior

An IllegalArgumentException should be thrown with a descriptive message like "ivLength must not exceed input array length".

### Actual Behavior

NegativeArraySizeException is thrown.

### Reproducibility

Always

### Relevant Log Output

```shell

```

### Anything else?
**Target method**
* Location: https://github.com/cryptomator/android/blob/develop/util/src/main/java/org/cryptomator/util/crypto/CryptoByteArrayUtils.java
* method:
```java
public static byte[] getBytes(byte[] encryptedBytesWithIv, int ivLength) {
if (encryptedBytesWithIv == null) {
throw new IllegalArgumentException("Input array must not be null");
}
byte[] bytes = new byte[encryptedBytesWithIv.length - ivLength];
System.arraycopy(encryptedBytesWithIv, ivLength, bytes, 0, bytes.length);
return bytes;
}
```

**unit test used**
```java
@Test
void testGetBytes_withIvLengthGreaterThanArrayLength_shouldThrow() {
byte[] input = {1, 2, 3};
int ivLength = 5; // greater than input length

assertThrows(NegativeArraySizeException.class, () -> {
CryptoByteArrayUtils.getBytes(input, ivLength);
});
}
```