Polymake.jl 0.11.15 released

Today Polymake.jl 0.11.15 has been released.

Diff since v0.11.14

Merged pull requests:

• CI: use 1.11-nightly (#474) (@benlorenz)
• CI: re-add nightly (1.12) (#475) (@benlorenz)
• Outdated docs removed (#477) (@lkastner)
• incidencematrix: allow empty rows (#478) (@benlorenz)
• bigobjectarray: fix conversion from polymake to julia (#479) (@benlorenz)

Closed issues:

• Oscar / Polymake is looking for mpfr in wrong spot on arm64 mac (#428)
• ERROR: LoadError: libcxxwrap_julia_jll not available on this platform (#476)