feat(tools): Normalized detected shell names to lowercase on Windows

[floitsch]

Closes espressif#16868

[github-actions]

	Warnings
⚠️	The source branch "floitsch/patch-head-5.4.1-pwsh.EXE" incorrect format: contains uppercase letters. This can cause troubles on case-insensitive file systems (macOS). Please rename your branch.
⚠️	The **target branch** for this Pull Request **must be the default branch** of the project (`master`). If you would like to add this feature to a different branch, please state this in the PR description and we will consider it.

👋 Hello floitsch, we appreciate your contribution to this project!

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[floitsch]

TBR.

[kasperl]

Looks good to me.