IPv6 not Working with TCP Monitor

**Describe the bug**
When trying to Monitor an TCP Port on IPv6, you get the Result: TCP connection failed: dial tcp: address [Monitored-IPv6]:[Monitored-Port]: too many colons in address
**To Reproduce**
Steps to reproduce the behavior:
1. Add an TCP Monitor with an IPv6
2. Get the Error.

**Expected behavior**
A Working Monitoring of an TCP Port over IPv6

**Screenshots**

**Additional context**
Peekaping is Hosted over the Docker Compose Stack with PostgreSQL

查找解析地址的 TCP 监控代码，很可能在网络检查模块中。错误“地址中的冒号过多”表明在拼接地址和端口时 IPv6 处理不当。找到构建连接目标（dial）的位置，确保 IPv6 地址用方括号括起来。检查 TCP 监控的现有测试，以添加 IPv6 测试用例。

由索引模型根据 Issue 内容生成。