[Chapel Merge] Fix testVarArgs error

Branch: refs/heads/main
Revision: 6553b38
Author: benharsh
Link: Unavailable
Log Message:

Merge pull request #20365 from benharsh/fix-vararg-test

Fix testVarArgs error

Trivial fix to use a size_t instead of an int to avoid a compiler warning.

Trivial, not reviewed.

Modified Files:
M compiler/dyno/test/resolution/testVarArgs.cpp

Compare: https://github.com/chapel-lang/chapel/compare/07f1ed490fa7...6553b38a24b7