benchmarks: fix warnings

Author: gribozavr

benchmark/single-source/unit-tests/ObjectiveCBridgingStubs.swift

@@ -169,7 +169,7 @@ func testObjectiveCBridgeStubURLAppendPath() {
   for _ in 0 ..< 10_000 {
     var url = startUrl
     for _ in 0 ..< 10 {
-      try! url.appendPathComponent("foo")
+      url.appendPathComponent("foo")
     }
   }
 }

benchmark/single-source/unit-tests/ObjectiveCNoBridgingStubs.swift

@@ -134,7 +134,7 @@ func testObjectiveCBridgeStubURLAppendPathRef() {
   for _ in 0 ..< 10_000 {
     var url = startUrl
     for _ in 0 ..< 10 {
-      url = try! url.appendingPathComponent("foo")
+      url = url.appendingPathComponent("foo")
     }
   }
 }