Make minio package support legacy MD5 checksum (#23768)

A feedback from discord:
https://discord.com/channels/322538954119184384/561007778139734027/1090185427115319386

Some storages like:

 * https://developers.cloudflare.com/r2/api/s3/api/
 * https://www.backblaze.com/b2/docs/s3_compatible_api.html

They do not support "x-amz-checksum-algorithm" header

But minio recently uses that header with CRC32C by default. So we have
to tell minio to use legacy MD5 checksum.

I guess this needs to be backported because IIRC we 1.19 and 1.20 are
using similar minio package.


The minio package code for SendContentMD5 looks like this:

<details>

<img width="755" alt="image"
src="https://user-images.githubusercontent.com/2114189/228186768-4f2f6f67-62b9-4aee-9251-5af714ad9674.png">

</details>

modules/setting/storage.go

@@ -42,6 +42,7 @@ func getStorage(rootCfg ConfigProvider, name, typ string, targetSec *ini.Section
 	sec.Key("MINIO_LOCATION").MustString("us-east-1")
 	sec.Key("MINIO_USE_SSL").MustBool(false)
 	sec.Key("MINIO_INSECURE_SKIP_VERIFY").MustBool(false)
+	sec.Key("MINIO_CHECKSUM_ALGORITHM").MustString("default")
 
 	if targetSec == nil {
 		targetSec, _ = rootCfg.NewSection(name)