update of jq in the Docker and fix index bloat query

1. In order to fix issue with bitint rounding in jq Replace jq 1.6 installed from ubuntu repos with jq 1.7.1 binary. It's a workaround while jq 1.7 is not available in official repos
2. fix jq calls to use new argument slurpfile instead of deprecated argfile
3. fix index bloat sql query to get correct report with non-superuser role (like pg_monitor)