Log Message:
tex-beamer{,-doc}: update to 3.61

## [v3.59]

- added `\transfly` macro for `Fly` page transition
- Preparations for LaTeX2e 2020-10-01

## [v3.61]

- `\beamer at bibiconwidth` already defined bug
- shadowboxes and transparent overlays
- workaround for misalignment of biblatex with sidebar theme