Proxy Port system properties: changed log level from error to warning

.changes/next-release/bugfix-AWSSDKforJavav2-1054797.json

@@ -0,0 +1,6 @@
+{
+    "type": "bugfix",
+    "category": "AWS SDK for Java v2",
+    "contributor": "",
+    "description": "When parsing proxy port from system properties, exceptions will be ignored and logged as warning."
+}

utils/src/main/java/software/amazon/awssdk/utils/internal/proxy/ProxySystemPropertyConfigProvider.java

@@ -46,7 +46,7 @@ private static Integer safelyParseInt(String string) {
         try {
             return Integer.parseInt(string);
         } catch (Exception e) {
-            log.error(() -> "Failed to parse string" + string, e);
+            log.warn(() -> "Failed to parse string. The failure will be ignored." + string, e);
         }
         return null;
     }