chore(deps): update registry.access.redhat.com/ubi9/ubi-micro docker …

…tag to v9.3-15 (#760)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

tekton-task-images/conftest/Dockerfile

@@ -11,6 +11,6 @@ RUN source /tmp/version && \
     conftest --version
 
 # Runnable
-FROM registry.access.redhat.com/ubi9/ubi-micro:9.3-13@sha256:d72202acf3073b61cb407e86395935b7bac5b93b16071d2b40b9fb485db2135d
+FROM registry.access.redhat.com/ubi9/ubi-micro:9.3-15@sha256:8e33df2832f039b4b1adc53efd783f9404449994b46ae321ee4a0bf4499d5c42
 
 COPY --from=builder /usr/local/bin/conftest /usr/local/bin/conftest