v0.23.0

Singular v0.23.0

Diff since v0.22.6

Merged pull requests:

• Use AbstractAlgebra.should_show_banner (fix #797) (#799) (@hannes14)
• Update GH actions (#802) (@fingolfin)
• fix hilbert_series_data for 0 entries (#803) (@hannes14)
• Adapt some show functions (#804) (@lgoettgens)

Closed issues:

• Use AbstractAlgebra.should_show_banner (#797)
• Start using pretty printing features such as LowercaseOff() (#798)