Release patch version of Reffy - v20.0.15

Bump web-specs from 3.82.0 to 3.82.1 (#2060)

Bump respec from 35.8.0 to 35.9.0 (#2058)

Bump js-yaml from 4.1.0 to 4.1.1 (#2053)

Bump rollup from 4.59.0 to 4.60.1 (#2057)

Bump brace-expansion from 2.0.2 to 2.0.3 (#2056)

Bump puppeteer from 24.39.1 to 24.40.0 (#2052)

Release patch version of Reffy - v20.0.14

Bump web-specs from 3.81.0 to 3.82.0 (#2049)

Bump undici from 7.22.0 to 7.24.4 (#2048)

Bump puppeteer from 24.38.0 to 24.39.1 (#2047)

Release patch version of Reffy - v20.0.13

Support expansion of mixin with a single interface in event postprocessing (#2043)

Release patch version of Reffy - v20.0.12

Bump puppeteer from 24.37.5 to 24.38.0 (#2041)