Update SwiftFormat version

[ktoso]

We can't use newer options, and other SSWG projects use newer formatter versions, leading to messy problems when trying to auto-format-on-commit.

E.g. we can't use the
error: Unknown option --extensionacl in configuration file.

which would prevent the mess caused in a recent PR, where I had to undo a lot of it by hand

[ktoso]

We should likely go through most sswg projects and update the version "everywhere" so the style is consistent, at least in those repos maintained by the same people (swift lot, metrics, tracing, etc)