Now that GLSA metadata was updated as of 2021-09-03, we need to
add the following entries to the GLSA allow list, to avoid build
failures caused by `glsa-check -t all`.
202006-03: perl 5.26.2, only SDK, allowlist
202008-01: python 2.7.15 & 3.6.5, only SDK, allowlist
202101-18: python 2.7.15 & 3.6.5, only SDK, allowlist
202104-04: python 2.7.15 & 3.6.5, only SDK, allowlist
202105-22: samba 4.12.9, not affected, samba has no ldap flag, no smbd.
202105-34: bash 4.3, non-trivial to update
202107-31: polkit 0.113, in-progress
202107-48: systemd 247.9, backported the fixes to v247.9.