Merge pull request #1135 from kenkoooo/pr/sin471/1131

fix isRatedContest()

Merge pull request #1124 from kenkoooo/dependabot/npm_and_yarn/atcode…

…r-problems-frontend/url-parse-1.5.7

build(deps): bump url-parse from 1.5.3 to 1.5.7 in /atcoder-problems-frontend

Merge pull request #770 from magurotuna/language-count-client-sqlx

[replacement with sqlx] LanguageCountClient