postgres: retrieve updater informaition

[hdonnay]

results in reports with vulnerabilities like:

    "410835": {
        "description": "A Bleichenbacher type side-channel based padding oracle attack was found in the way nettle handles endian conversion of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run a process on the same physical core as the victim process, could use this flaw extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.",
        "fixed_in_version": "",
        "id": "410835",
        "links": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16869 http://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-16869.html http://cat.eyalro.net/ https://lists.lysator.liu.se/pipermail/nettle-bugs/2018/007363.html https://lists.debian.org/debian-lts/2019/03/msg00021.html",
        "name": "CVE-2018-16869",
        "severity": "Low",
        "updater": "ubuntu-bionic-updater"
    },

[ldelossa]

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