Fix nil pointer panic in S3 DeleteObjects error logging

[Copilot]

During AWS SDK v2 migration, types.ObjectIdentifier.VersionId changed from value to *string. Error logging in DeleteObjects unconditionally dereferenced this pointer, causing panics when deleting from non-versioned buckets.

Changes

• pkg/storages/s3/folder.go: Added nil check before dereferencing VersionId in error log
  • Uses "none" as version string when VersionId is nil
  • Occurs when versioning disabled or objects created without version IDs

// Before (panics when VersionId is nil)
tracelog.DebugLogger.Printf("object %s version %s", *obj.Key, *obj.VersionId)

// After
versionStr := "none"
if obj.VersionId != nil {
    versionStr = *obj.VersionId
}
tracelog.DebugLogger.Printf("object %s version %s", *obj.Key, versionStr)

Resolves panic in wal-g_pg_backup_mark_impermanent_test and other delete operations on non-versioned buckets.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[FEATURE] update aws-sdk-go to aws-sdk-go-v2</issue_title>
<issue_description>### What feature would you like?

during build there's a warning

go: module github.com/aws/aws-sdk-go is deprecated: aws-sdk-go is deprecated. Use aws-sdk-go-v2.

can we do that update ?

Why is this feature useful?

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [FEATURE] update aws-sdk-go to aws-sdk-go-v2 #10

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