fix(test): use double quote in json

Author: cnblogs-dudu

src/IdentityServer4/test/IdentityServer.IntegrationTests/Endpoints/Authorize/JwtRequestAuthorizeTests.cs

@@ -32,7 +32,7 @@ public class JwtRequestAuthorizeTests
         private readonly IdentityServerPipeline _mockPipeline = new();
         private readonly Client _client;
 
-        private readonly string _symmetricJwk = @"{ 'kty': 'oct', 'use': 'sig', 'kid': '1', 'k': 'nYA-IFt8xTsdBHe9hunvizcp3Dt7f6qGqudq18kZHNtvqEGjJ9Ud-9x3kbQ-LYfLHS3xM2MpFQFg1JzT_0U_F8DI40oby4TvBDGszP664UgA8_5GjB7Flnrlsap1NlitvNpgQX3lpyTvC2zVuQ-UVsXbBDAaSBUSlnw7SE4LM8Ye2WYZrdCCXL8yAX9vIR7vf77yvNTEcBCI6y4JlvZaqMB4YKVSfygs8XqGGCHjLpE5bvI-A4ESbAUX26cVFvCeDg9pR6HK7BmwPMlO96krgtKZcXEJtUELYPys6-rbwAIdmxJxKxpgRpt0FRv_9fm6YPwG7QivYBX-vRwaodL1TA', 'alg': 'HS256'}";
+        private readonly string _symmetricJwk = @"{ ""kty"": ""oct"", ""use"": ""sig"", ""kid"": ""1"", ""k"": ""nYA-IFt8xTsdBHe9hunvizcp3Dt7f6qGqudq18kZHNtvqEGjJ9Ud-9x3kbQ-LYfLHS3xM2MpFQFg1JzT_0U_F8DI40oby4TvBDGszP664UgA8_5GjB7Flnrlsap1NlitvNpgQX3lpyTvC2zVuQ-UVsXbBDAaSBUSlnw7SE4LM8Ye2WYZrdCCXL8yAX9vIR7vf77yvNTEcBCI6y4JlvZaqMB4YKVSfygs8XqGGCHjLpE5bvI-A4ESbAUX26cVFvCeDg9pR6HK7BmwPMlO96krgtKZcXEJtUELYPys6-rbwAIdmxJxKxpgRpt0FRv_9fm6YPwG7QivYBX-vRwaodL1TA"", ""alg"": ""HS256""}";
         private readonly RsaSecurityKey _rsaKey;
 
         public JwtRequestAuthorizeTests()