Redact SSE-C key in logs

[MartinNowak]

Expected behavior

Redact X-Amz-Server-Side-Encryption-Customer-Key:

Actual behavior

Shows in debug logs where `AWS4-HMAC-SHA256 Credential=REDACTED

Steps to reproduce the behavior

mc --debug cat alias/bucket/key --enc-c alias/=0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef

mc --version

mc version DEVELOPMENT.GOGET (commit-id=DEVELOPMENT.GOGET)
Runtime: go1.24.2 linux/amd64
Copyright (c) 2015-0000 MinIO, Inc.
License GNU AGPLv3 <https://www.gnu.org/licenses/agpl-3.0.html>

System information