[GitHub] Add default reviewers for Presburger library (#76627)

Added @Groverkss and @Superty as default reviewers for Presburger lib
paths.

Author: Groverkss

.github/CODEOWNERS

@@ -82,6 +82,9 @@
 /mlir/**/*EmulateNarrowType* @hanhanW
 /mlir/lib/Dialect/Vector/Transforms/* @hanhanW @nicolasvasilache
 
+# Presburger library in MLIR
+/mlir/**/*Presburger* @Groverkss @Superty
+
 # Tensor Dialect in MLIR.
 /mlir/lib/Dialect/Tensor/IR/TensorTilingInterfaceImpl.cpp @hanhanW @nicolasvasilache
 /mlir/lib/Dialect/Tensor/Transforms/FoldIntoPackAndUnpackPatterns.cpp @hanhanW @nicolasvasilache