Convert to Hex only on Encoding.UTF8.GetString possible exception

Has OutOfMemory exceptions can occure in native Encoding.UTF8.GetString, we should not convert result to hex values

Author: jcaspes

src/StackExchange.Redis/RedisValue.cs

@@ -784,7 +784,10 @@ private static bool TryParseDouble(ReadOnlySpan<byte> blob, out double value)
                     {
                         return Format.GetString(span);
                     }
-                    catch
+                    catch (Exception e) when // Only catch exception throwed by Encoding.UTF8.GetString
+                        (e is DecoderFallbackException
+                        || e is ArgumentException
+                        || e is ArgumentNullException)
                     {
                         return ToHex(span);
                     }