fix: 修正 94aaff4 引入的错误读取证书问题

Author: 方祝立

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java

@@ -14,6 +14,7 @@
 import java.security.PublicKey;
 import java.security.cert.Certificate;
 import java.security.cert.X509Certificate;
+import java.util.Base64;
 import java.util.Optional;
 import javax.net.ssl.SSLContext;
 import lombok.Data;
@@ -371,7 +372,7 @@ private InputStream loadConfigInputStream(String configString, String configPath
     if (configContent != null) {
       inputStream = new ByteArrayInputStream(configContent);
     } else if (StringUtils.isNotEmpty(configString)) {
-      configContent = configString.getBytes(StandardCharsets.UTF_8);
+      configContent = Base64.getDecoder().decode(configString);
       inputStream = new ByteArrayInputStream(configContent);
     } else {
       if (StringUtils.isBlank(configPath)) {