Disable dev preview for `CrateVersioner` (#3241)

## Motivation and Context
In this stable release branch, `CrateVersioner` needs to start
versioning SDK crates in a way they are stable.

----

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buildSrc/src/main/kotlin/aws/sdk/CrateVersioner.kt

@@ -24,7 +24,7 @@ object CrateVersioner {
                 IndependentCrateVersioner(
                     VersionsManifest.fromFile(versionsManifestPath),
                     ModelMetadata.fromFile(modelMetadataPath),
-                    devPreview = true,
+                    devPreview = false,
                     smithyRsVersion = getSmithyRsVersion(rootProject),
                 )
             }