3.1.1

• zimdump: Correctly print the main page (@mgautierfr #293)
• zimcheck: Correctly print spend time to avoid performance test to fail on slow
  hardware (@veloman-yunkan #288)
• zimwriterfs: Fix usage message indentation (@kelson42 #291)
• Cross compilation: Correctly detect host machine (@kelson42 #290)
• CI: Fix libzim-dev deps (@legoktm #284)
• CI: Remove Ubuntu Hirsute (@legoktm #286)