Log Message:
tex-make4ht{,-doc}: update to 0.3l

0.3l
- fixed issues with filenames on Windows.
- use `rmarkdown` package to process `.rmd` files in the `preprocess_input`
  extension (thanks to James Clawson).

0.3k
- fixed support for filenames that contain () characters
- fixed issues with some fonts in the ODT output
- fixed a lot of issues in the MathML post-processing
- fixed handling of parameters in the `staticsite` extension
- prevented multiple executions of filters
- current log level is now available as `logging.show_level`

0.3j
- fixed fatal error introduced in the previous release - graphics
  handling in the ODT format could end in Lua runtime error
- fixed post-processing of MathML files in the ODT format
- introduced new fix for MathML in "mathmlfixes" DOM filter - it
  adds "<mrow>" elements when necessary