Eisvogel (Version 3.1.0)

• feat: Merge changes from the pandoc default LaTeX template from version 3.6 (f1c01b0).
• feat: Merge changes from the pandoc default LaTeX template from version 3.6.1 (b033aa1).
• docs: add example twoside for a two-sided document (#412)
• docs: add example columns for a two column document (#411)
• docs: remove unneeded package ulem from the section Required LaTeX Packages in the README and from ci
• docs: fix typos and convert links to HTTPS (#400, deining)
• chore: update copyright year in LICENSE
• ci: bump GitHub action workflows to avoid deprecation warnings (#401, deining)
• fix: correct link to commit 2a6268d in CHANGELOG.md