[gnome-software] (10 commits) ...Merge branch 'refactor-threads12' into 'main'

[Milan Crha <mcrha src gnome org>]

Summary of changes:

  fda6770... flatpak: Use 64-bit cache ages
  4a35fce... gs-cmd: Rename a variable to make its units clearer
  9043889... gs-loading-page: Rename a variable to make its units cleare
  5eec6b8... gs-utils: Remove redundant g_file_test() check
  80c0ecf... gs-utils: Add missing precondition checks
  eff6280... gs-utils: Use GFile rather than filename arguments
  17e45a0... fedora-pkgdb-collections: Split JSON parsing out into a hel
  d5ee734... gs-external-appstream-utils: Consistently use 64-bit cache 
  3ce9892... gs-odrs-provider: Consistently use 64-bit cache ages
  ac60e31... Merge branch 'refactor-threads12' into 'main'