scala instructions shouldn't point to ` VirtusLab/coursier-m1`

[jsoref]

(also, fair point that Scala install instructions should no longer be pointing here)

Originally posted by @Gedochao in VirtusLab/coursier-m1#156

scala-lang/_data/setup-scala.yml

Lines 2 to 4 in 9bfdd99

	linux-arm64: curl -fL https://github.com/VirtusLab/coursier-m1/releases/latest/download/cs-aarch64-pc-linux.gz | gzip -d > cs && chmod +x cs && ./cs setup
	macOS-x86-64: curl -fL https://github.com/coursier/coursier/releases/latest/download/cs-x86_64-apple-darwin.gz | gzip -d > cs && chmod +x cs && (xattr -d com.apple.quarantine cs || true) && ./cs setup
	macOS-arm64: curl -fL https://github.com/VirtusLab/coursier-m1/releases/latest/download/cs-aarch64-apple-darwin.gz | gzip -d > cs && chmod +x cs && (xattr -d com.apple.quarantine cs || true) && ./cs setup

• Linux instructions don't work for alpine #1814