style: enable RedundantModifier in checkstyle

[vil02]

Related to #5119

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 38.88889% with 33 lines in your changes are missing coverage. Please review.

Project coverage is 37.34%. Comparing base (1e2d7e9) to head (f33617f).

Files	Patch %	Lines
...ithms/datastructures/trees/PrintTopViewofTree.java	0.00%	4 Missing ⚠️
...om/thealgorithms/datastructures/graphs/A_Star.java	0.00%	3 Missing ⚠️
...thms/datastructures/graphs/ConnectedComponent.java	0.00%	3 Missing ⚠️
...c/main/java/com/thealgorithms/others/Dijkstra.java	0.00%	3 Missing ⚠️
...om/thealgorithms/datastructures/graphs/Graphs.java	0.00%	2 Missing ⚠️
...ithms/datastructures/stacks/StackOfLinkedList.java	0.00%	2 Missing ⚠️
...gorithms/datastructures/trees/nearestRightKey.java	0.00%	2 Missing ⚠️
...ava/com/thealgorithms/datastructures/bags/Bag.java	0.00%	1 Missing ⚠️
.../thealgorithms/datastructures/caches/LRUCache.java	50.00%	1 Missing ⚠️
.../thealgorithms/datastructures/caches/MRUCache.java	50.00%	1 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5140   +/-   ##
=========================================
  Coverage     37.33%   37.34%           
- Complexity     2348     2349    +1     
=========================================
  Files           517      517           
  Lines         15618    15618           
  Branches       2971     2971           
=========================================
+ Hits           5831     5832    +1     
  Misses         9497     9497           
+ Partials        290      289    -1     

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[siriak]

Looks good, thanks!