Update devDependencies

• hugo-bin ^0.64.5 → ^0.65.0
• karma-firefox-launcher ^2.0.0 → ^2.1.0
• linkinator ^2.2.0 → ^2.2.2
• postcss-cli ^8.1.0 → ^8.2.0
• rollup ^2.32.1 → ^2.33.1
• sass ^1.27.1 → ^1.28.0