Polymake 4.3 was released Dec 2020L

• https://polymake.org/doku.php/news/release_4_3

• https://polymake.org/doku.php/news/release_4_2

• https://polymake.org/doku.php/news/release_4_1

• https://polymake.org/doku.php/news/release_4_0

• https://polymake.org/doku.php/news/release_3_6

• https://polymake.org/doku.php/news/release_3_5,

• https://polymake.org/lib/exe/fetch.php/download/polymake-4.3-minimal.tar.bz2

Depends on #27745

CC: @sebasguts @videlec @jplab @kliem @yuan-zhou

Component: packages: experimental

Reviewer: Thierry Monteil

Issue created by migration from https://trac.sagemath.org/ticket/28435