chore(deps): update ghcr.io/regclient/regctl:alpine docker digest to 53115c3 (#478)

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

Author: renovate[bot]

Dockerfile

@@ -10,7 +10,7 @@ COPY ./ ./
 
 RUN CGO_ENABLED=0 go build -o /go/bin/composevalidate -trimpath -ldflags="-s -w" .
 
-FROM ghcr.io/regclient/regctl:alpine@sha256:31972bd10bfb44b505fd77e379855078b8064e2baa087dce77d7dc7823236684
+FROM ghcr.io/regclient/regctl:alpine@sha256:53115c38927846d4f2ae111121cca7e95a033fd84132d69569e814ede1a696d3
 
 COPY --from=build /go/bin/composevalidate /usr/local/bin/