Fix code scanning alert no. 9: Use of a broken or risky cryptographic algorithm

[HTHou]

Fixes https://github.com/apache/tsfile/security/code-scanning/9

To fix the problem, we need to replace the use of the MD5 algorithm with a stronger, modern cryptographic algorithm. The best way to do this without changing existing functionality is to use SHA-256, which is widely regarded as secure.

1. General fix: Replace instances of MessageDigest.getInstance("MD5") with MessageDigest.getInstance("SHA-256").
2. Detailed fix: Update the getNormalKeyStr and getEncryptParameter methods to use SHA-256 instead of MD5.
3. Specific changes: Modify lines 124 and 157 in the EncryptUtils.java file.
4. Required imports: No new imports are needed as MessageDigest is already imported.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.63%. Comparing base (6c4f911) to head (a2e3e0f).

Files with missing lines	Patch %	Lines
...n/java/org/apache/tsfile/encrypt/EncryptUtils.java	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #290 +/- ## ======================================== Coverage 63.63% 63.63% ======================================== Files 501 501 Lines 31787 31787 Branches 4110 4110 ======================================== Hits 20228 20228 Misses 11082 11082 Partials 477 477 ```

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