Fixed the FileProvider generic definition for the ServeURIUseCase use case in the library target.

Sources/DocCMiddleware/Internal/Use Cases/ServeURIUseCase.swift

@@ -16,12 +16,12 @@ import struct Hummingbird.Response
 import struct Logging.Logger
 
 /// A use case that serves a resource, defined by its URI path, from a physical location.
-struct ServeURIUseCase<FileSystemProvider: FileProvider> {
+struct ServeURIUseCase<Provider: FileProvider> {
     
     // MARK: Properties
     
     /// A type that conforms to a protocol that defines file system interactions.
-    let fileProvider: FileSystemProvider
+    private let fileProvider: Provider
     
     /// A type that interacts with the logging system.
     private let logger: Logger
@@ -33,7 +33,7 @@ struct ServeURIUseCase<FileSystemProvider: FileProvider> {
     ///   - fileProvider: A type that conforms to a protocol that defines file system interactions.
     ///   - logger: A type that interacts with the logging system.
     init(
-        fileProvider: FileSystemProvider,
+        fileProvider: Provider,
         logger: Logger
     ) {
         self.fileProvider = fileProvider
@@ -77,7 +77,7 @@ struct ServeURIUseCase<FileSystemProvider: FileProvider> {
             id: fileIdentifier,
             context: contextualInfo.context
         )
-        
+
         defer {
             logger.log(
                 level: .debug,