Update confluentinc/cp-zookeeper Docker tag to v7.6.1

This MR contains the following updates:

Package	Update	Change
confluentinc/cp-zookeeper	minor	7.4.4-1-ubi8 -> 7.6.1-1-ubi8

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hardening_manifest.yaml

@@ -6,7 +6,7 @@ name: "confluentinc/cp-schema-registry"
 # The most specific version should be the first tag and will be shown
 # on ironbank.dso.mil
 tags:
-  - "7.4.4-1-ubi8"
+  - "7.6.1-1-ubi8"
   - "7.4.4"
   - "7.4.x"
   - "7.4"
@@ -23,7 +23,7 @@ labels:
   org.opencontainers.image.licenses: "CONFLUENT ENTERPRISE LICENSE"
   org.opencontainers.image.url: "https://docs.confluent.io/platform/current/overview.html"
   org.opencontainers.image.vendor: "Confluent"
-  org.opencontainers.image.version: "7.4.4"
+  org.opencontainers.image.version: "7.6.1"
   mil.dso.ironbank.image.keywords: "confluent,cflt,kafka,zookeeper,operator"
   mil.dso.ironbank.image.type: "commercial"
   mil.dso.ironbank.product.name: "Confluent Platform"