chore(deps): update grafana/k6 docker tag to v1.7.1

Author: renovate[bot]

Dockerfile

@@ -21,5 +21,5 @@ RUN xk6 build --output /k6 \
     --with github.com/grafana/xk6-loki@v${XK6_LOKI_VERSION}
 
 # Use the operator's base image and override the k6 binary
-FROM grafana/k6:1.4.2@sha256:3656673de3f30424e8ebcfa46acd9558d83b6a43612d0f668ffeac953950c6c7
+FROM grafana/k6:1.7.1@sha256:4fd3a694926b064d3491d9b02b01cde886583c4931f1223816e3d9a7bdfa7e0f
 COPY --from=builder /k6 /usr/bin/k6