Cargo.toml: v0.29.0

[digitalmoksha]

Bump version in prep for releasing 0.29.0

[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
./bench.sh ./comrak-658b919	317.8 ± 1.0	316.8	321.4	2.81 ± 0.09
./bench.sh ./comrak-main	317.3 ± 1.7	314.9	323.7	2.81 ± 0.09
./bench.sh ./pulldown-cmark	113.0 ± 3.5	111.5	130.0	1.00
./bench.sh ./cmark-gfm	117.4 ± 0.8	116.0	118.9	1.04 ± 0.03
./bench.sh ./markdown-it	468.2 ± 1.5	463.6	471.5	4.14 ± 0.13

Run on Thu Oct 10 00:53:38 UTC 2024