spectre-meltdown-checker: update to 0.44

spectre-meltdown-checker: update to 0.44

Full changelog as per https://github.com/speed47/spectre-meltdown-checker/releases/tag/v0.44 :

    feat: add support for SRBDS related vulnerabilities
    feat: add zstd kernel decompression (#370)
    enh: arm: add experimental support for binary arm images
    enh: rsb filling: no longer need the 'strings' tool to check for kernel support in live mode
    fix: fwdb: remove Intel extract tempdir on exit
    fix: has_vmm: ignore kernel threads when looking for a hypervisor (fixes #278)
    fix: fwdb: use the commit date as the intel fwdb version
    fix: fwdb: update Intel's repository URL
    fix: arm64: cve-2017-5753: kernels 4.19+ use a different nospec macro
    fix: on CPU parse info under FreeBSD
    chore: github: add check run on pull requests
    chore: fwdb: update to v165.20201021+i20200616

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>