Update Pangram.java

[preritasaini1]

Updated the Pangram.java file by adding a bitwise approach and improving code readability

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.00000% with 11 lines in your changes missing coverage. Please review.

Project coverage is 72.37%. Comparing base (e94be71) to head (6d0d701). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...c/main/java/com/thealgorithms/strings/Pangram.java	45.00%	9 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6048 +/- ## ============================================ - Coverage 72.42% 72.37% -0.06% + Complexity 4991 4990 -1 ============================================ Files 655 655 Lines 17593 17602 +9 Branches 3388 3392 +4 ============================================ - Hits 12742 12739 -3 - Misses 4371 4381 +10 - Partials 480 482 +2 ```

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[preritasaini1]

Hello everyone, I am ne in this contributing world, just checking in on my pull request. I'm excited to learn from your feedback and improve my contributions. Thanks!