v1.21.5 release

What's Changed

• [release-1.21] fix: CVE-2023-2431 by @andyzhangx in #962
• [release-1.21] cleanup: remove secret print in error message by @k8s-infra-cherrypick-robot in #975
• [release-1.21] cleanup: add secret name in the log by @k8s-infra-cherrypick-robot in #993
• [release-1.21] fix: add VolumeStats cache to avoid massive statfs calls by @andyzhangx in #1018
• [release-1.21] test: fix verify-helm-chart failure by @k8s-infra-cherrypick-robot in #1038
• [release-1.21] cleanup: fix typo by @k8s-infra-cherrypick-robot in #1036
• [release-1.21] fix: CVE-2023-39325 by @andyzhangx in #1050
• [release-1.21] test: don't return error in blob_log.sh by @k8s-infra-cherrypick-robot in #1058
• [release-1.21] fix: nfs volume creation failure due to Microsoft.Storage.Global Service endpoint enabled by @k8s-infra-cherrypick-robot in #1065
• doc: cut v1.21.5 release by @andyzhangx in #1079

Full Changelog: v1.21.4...v1.21.5