use invariant culture in FakeLogger tests(#5841)

Co-authored-by: Tomáš Wiesner <[email protected]>

Author: Demo30

test/Libraries/Microsoft.AspNetCore.Diagnostics.Middleware.Tests/Logging/AcceptanceTests.cs

@@ -419,7 +419,7 @@ async static (logCollector, client) =>
 
                 Assert.Equal(9, state!.Count);
                 Assert.Single(state, x => x.Key == TestHttpLogEnricher.Key1 && x.Value == TestHttpLogEnricher.Value1);
-                Assert.Single(state, x => x.Key == TestHttpLogEnricher.Key2 && x.Value == TestHttpLogEnricher.Value2.ToString(CultureInfo.CurrentCulture));
+                Assert.Single(state, x => x.Key == TestHttpLogEnricher.Key2 && x.Value == TestHttpLogEnricher.Value2.ToString(CultureInfo.InvariantCulture));
                 Assert.Single(state, x => x.Key == HttpLoggingTagNames.Method && x.Value == HttpMethod.Delete.ToString());
                 Assert.DoesNotContain(state, x => x.Key == HttpLoggingTagNames.RequestBody);
                 Assert.DoesNotContain(state, x => x.Key == HttpLoggingTagNames.ResponseBody);
@@ -493,11 +493,11 @@ async static (logCollector, client) =>
 
                 Assert.Equal(5, firstState!.Count);
                 Assert.DoesNotContain(firstState, x => x.Key == TestHttpLogEnricher.Key1 && x.Value == TestHttpLogEnricher.Value1);
-                Assert.DoesNotContain(firstState, x => x.Key == TestHttpLogEnricher.Key2 && x.Value == TestHttpLogEnricher.Value2.ToString(CultureInfo.CurrentCulture));
+                Assert.DoesNotContain(firstState, x => x.Key == TestHttpLogEnricher.Key2 && x.Value == TestHttpLogEnricher.Value2.ToString(CultureInfo.InvariantCulture));
 
                 Assert.Equal(3, secondState!.Count);
                 Assert.Single(secondState, x => x.Key == TestHttpLogEnricher.Key1 && x.Value == TestHttpLogEnricher.Value1);
-                Assert.Single(secondState, x => x.Key == TestHttpLogEnricher.Key2 && x.Value == TestHttpLogEnricher.Value2.ToString(CultureInfo.CurrentCulture));
+                Assert.Single(secondState, x => x.Key == TestHttpLogEnricher.Key2 && x.Value == TestHttpLogEnricher.Value2.ToString(CultureInfo.InvariantCulture));
             });
     }