chibi-scheme: use tarball with stable hash

[lassik]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[lassik]

cc @ashinn from https://github.com/ashinn/chibi-scheme

[SMillerDev]

Downgrading to http and a completely different host seems like a problem. Why change this?

[lassik]

The old tarball was auto-generated by GitHub from a Git tag. Those are not guaranteed to have stable hashes.

Chanegd from HTTP to HTTPS.

[ashinn]

FWIW made a github release with a stable asset: https://github.com/ashinn/chibi-scheme/releases/download/0.11/chibi-scheme-0.11.0.tgz