dumpling -V outputs the information to stderr

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)
```shell
dumpling -V > stdout.txt 2> stderr.txt

# cat stdout.txt
[2024/05/27 09:59:27.893 +00:00] [INFO] [cgroup_cpu_linux.go:96] ["TiDB runs in a container, mount info: 5203 1384 0:675 / / rw,relatime master:1283 - overlay overlay rw,lowerdir=/var/lib/docker/overlay2/l/RSQKJ6XAXRJC4QRKU5N2YBPVG2:/var/lib/docker/overlay2/l/ZGOGR23P4BFFT2PQUWLB4N7N6R:/var/lib/docker/overlay2/l/IEJ2BUONRP6Y2DSYV6CFILLPRS:/var/lib/docker/overlay2/l/ALCWJ5Q76VFSZQ2QJTUSZKESTB:/var/lib/docker/overlay2/l/XMZAD2QYTYH5NCB7DKWASKYR3Y:/var/lib/docker/overlay2/l/STMAPHYKPVLLKHIJXJ4ESILQZ7,upperdir=/var/lib/docker/overlay2/53b0c7b59223a99d735a8a5086223a43ac2226fa2f7481210495e49a022c000d/diff,workdir=/var/lib/docker/overlay2/53b0c7b59223a99d735a8a5086223a43ac2226fa2f7481210495e49a022c000d/work"]

# cat stderr.txt
Release version: v8.1.0
Git commit hash: 945d07c5d5c7a1ae212f6013adfb187f2de24b23
Git branch: HEAD
Build timestamp: 2024-05-21 03:51:57Z
Go version: go version go1.21.10 linux/amd64

```

### 2. What did you expect to see? (Required)
output version info to stdout

### 3. What did you see instead (Required)
output version info to stderror

### 4. What is your TiDB version? (Required)
release-8.1