Fix compile warnings for Swift 6 language mode (#313)

Author: b1ackturtle

Diff for: Tests/LoggingTests/LoggingTest.swift

@@ -399,7 +399,7 @@ class LoggingTest: XCTestCase {
                                                    "lazy": .stringConvertible(LazyMetadataBox { "rendered-at-first-use" })])
     }
 
-    private func dontEvaluateThisString(file: StaticString = #file, line: UInt = #line) -> Logger.Message {
+    private func dontEvaluateThisString(file: StaticString = #filePath, line: UInt = #line) -> Logger.Message {
         XCTFail("should not have been evaluated", file: file, line: line)
         return "should not have been evaluated"
     }

Diff for: Tests/LoggingTests/TestLogger.swift

@@ -219,7 +219,7 @@ extension History {
                      message: String,
                      metadata: Logger.Metadata? = nil,
                      source: String? = nil,
-                     file: StaticString = #file,
+                     file: StaticString = #filePath,
                      fileID: String = #fileID,
                      line: UInt = #line) {
         let source = source ?? Logger.currentModule(fileID: "\(fileID)")
@@ -232,7 +232,7 @@ extension History {
                         message: String,
                         metadata: Logger.Metadata? = nil,
                         source: String? = nil,
-                        file: StaticString = #file,
+                        file: StaticString = #filePath,
                         fileID: String = #file,
                         line: UInt = #line) {
         let source = source ?? Logger.currentModule(fileID: "\(fileID)")