Singular.jl 0.22.6 released

Today Singular.jl 0.22.6 has been released.

Diff since v0.22.4

Merged pull requests:

• Hs/hilb (#787) (@hannes14)
• add std_with_HC (#790) (@hannes14)
• update libsingular_julia_jll (0.44.2), Singular_jll (403.216.1602) (#794) (@hannes14)
• update to version 0.22.6 (#795) (@hannes14)