Fixe Conversion Warning in Parallelizer

Hunter Belangerrequested to merge
HunterBelanger/eigen:fix/parallelizer_conversion_warning into master

Reference issue

This does not address any issue as far as I am aware.

What does this implement/fix?

This MR addressed a conversion warning when compiling with GCC 11.4.0 on Linux with OpenMP enabled. Before, I was getting the following warning in my project:

eigen-src/Eigen/src/Core/products/Parallelizer.h:220:34: warning: conversion from ‘long int’ to ‘int’ may change value [-Wconversion]
  220 |     GemmParallelInfo<Index> info(i, static_cast<int>(actual_threads), task_info);

Additional information

After applying this modification, all tests are passing on my system.

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