fix: Amend syntax in conda-meta/history to prevent conda.history.History.parse() error

[jaimergp]

#995 introduced a Pixi-generated conda-meta/history. Sadly, # is a special character in the history file, which ends up breaking the conda.history.History.parse() function:

$ python -c "from conda.history import History as H; print(H('.pixi/envs/default').parse())"                  
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/jrodriguez/devel/conda-pip/.pixi/envs/default/lib/python3.10/site-packages/conda/history.py", line 138, in parse
    res[-1][2].append(line)
IndexError: list index out of range

// does work without issues.

[wolfv]

Thanks!