Bump github.com/nicklockwood/swiftformat in /BuildTools (#271)

Bumps [github.com/nicklockwood/swiftformat](https://github.com/nicklockwood/SwiftFormat) from 0.54.5 to 0.54.6.
- [Release notes](https://github.com/nicklockwood/SwiftFormat/releases)
- [Commits](nicklockwood/SwiftFormat@0.54.5...0.54.6)

---
updated-dependencies:
- dependency-name: github.com/nicklockwood/swiftformat
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

BuildTools/Package.resolved

@@ -123,8 +123,8 @@
         "repositoryURL": "https://github.com/nicklockwood/SwiftFormat",
         "state": {
           "branch": null,
-          "revision": "ab6844edb79a7b88dc6320e6cee0a0db7674dac3",
-          "version": "0.54.5"
+          "revision": "86ed20990585f478c0daf309af645c2a528b59d8",
+          "version": "0.54.6"
         }
       },
       {