editors/tp-note: update to 1.21.3

Link docs with new sort-tag shorthand link syntax:

*  Hyperlinks to other Tp-Note documents can now be shortened by referencing
    only the target's sort-tag, e.g. `[my doc](<home/20230510-my note.md>)` is
    equivalent to `[my doc](<home/20230510>)`. Autolinks can be shortened as
    well: `<http:home/20230510-my note.md>` becomes `<http:home/20230510>`

*  New environment variable: `TPNOTE_CONFIG`

*  The prepend_dot filter is replaced by the prepend filter.
    The concerned filename templates have been updated.

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