Revert "Merge pull request #1116 from bnbarham/bump-to-604"

This reverts commit ac9783f, reversing
changes made to 400d684.

Author: allevato

.github/workflows/publish_release.yml

@@ -14,13 +14,13 @@ on:
         required: true
       swift_format_version:
         type: string
-        default: 604.0.0
+        default: 603.0.0
         description: "swift-format version"
         # The version of swift-format to tag. If this is a prerelease, `-prerelease-<date>` is added to this version.
         required: true
       swift_syntax_tag:
         type: string
-        default: 604.0.0
+        default: 603.0.0
         description: "swift-syntax version"
         # The swift-syntax version to depend on. If this is a prerelease, the latest swift-syntax prerelease tag for this version is used.
         required: true