Fixing `pijul git`

Dependencies

• [2] BJOZ25EU Deterministic Git import
• [3] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• replacement in pijul/src/commands/git.rs at line 2
  [3.137305]→[2.0:44](∅→∅)
  − use std::collections::{BTreeMap, BTreeSet};
  [3.137305]

  [3.137367]
  + use std::collections::{BTreeMap, BTreeSet, HashMap};
• edit in pijul/src/commands/git.rs at line 425
  [3.151427]

  [3.151427]
  + &mut HashMap::new(),