Bump ubi9/ubi-micro from 9.3-13 to 9.3-15 (#640)

Bumps ubi9/ubi-micro from 9.3-13 to 9.3-15.

---
updated-dependencies:
- dependency-name: ubi9/ubi-micro
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -73,7 +73,7 @@ RUN microdnf --refresh --assumeyes upgrade ca-certificates
 
 # ubi release image
 # -----------------------------------
-FROM registry.access.redhat.com/ubi9/ubi-micro:9.3-13 as release-ubi
+FROM registry.access.redhat.com/ubi9/ubi-micro:9.3-15 as release-ubi
 
 ENV BIN_NAME=vault-secrets-operator
 ARG PRODUCT_VERSION