Singular.jl 0.14.0 released

Today Singular.jl 0.14.0 has been released.

Diff since v0.13.1

Merged pull requests:

• CI: update some actions to latest versions (#594) (@fingolfin)
• test code for copy bug (#596) (@tthsqe12)
• add Singulars division (#597) (@hannes14)
• fix degree_bound tests (#598) (@tthsqe12)
• add docs for call_interpreter and lookup_library_symbol (#599) (@tthsqe12)
• bump to version 0.14 (#602) (@tthsqe12)