Modify F# Tests

[pascalecu]

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I Am Modifying an Existing Code Snippet or Existing Tests

• I fixed Modify F# Tests #5458
• I did not include any extra folders/libraries
• I have read about modifying existing code snippets or tests in the contributing documentation
• I have explained why this modification is necessary either in the issue linked above or in the notes below
• I named the pull request using Modify {PROJECT} {tests} in {LANGUAGE} format

Other Notes

This follows the same reasoning as #4553. I hit this problem when I was working on #5457 and noticed it ran on F# 4.5, which was unusual given that testinfo.yml claimed tag: "10-netcore".