refactor: remove unused error variant

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c62a631) 92.65% compared to head (3f136ef) 92.62%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #215 +/- ## ========================================== - Coverage 92.65% 92.62% -0.04% ========================================== Files 57 57 Lines 2847 2847 ========================================== - Hits 2638 2637 -1 - Misses 209 210 +1 ```

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Micro-Benchmark Results

Linux

group                          main                                   pr
-----                          ----                                   --
tarball/download_dependency    1.01      6.8±0.46ms   637.6 KB/sec    1.00      6.7±0.32ms   643.5 KB/sec

[github-actions[bot]]

Integrated-Benchmark Report (Linux)

Scenario: Frozen Lockfile

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
pacquet@HEAD	128.9 ± 9.4	116.3	148.2	1.01 ± 0.12
pacquet@main	127.1 ± 11.7	109.1	146.4	1.00

BENCHMARK_REPORT.json

```json { "results": [ { "command": "pacquet@HEAD", "mean": 0.12886527408666668, "stddev": 0.009390801958232876, "median": 0.12725571322, "user": 0.05929497333333333, "system": 0.20187049999999998, "min": 0.11626900122, "max": 0.14821123522000001, "times": [ 0.13326030922, 0.13528109322, 0.12213969722000001, 0.12725571322, 0.12304037622000001, 0.11626900122, 0.11957694822, 0.14821123522000001, 0.12799842222000002, 0.13870057222, 0.12209655722, 0.13570431622, 0.11956043922000001, 0.14136545122, 0.12251897922 ], "exit_codes": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] }, { "command": "pacquet@main", "mean": 0.12706121097, "stddev": 0.01171972575629837, "median": 0.12513366872, "user": 0.05461075249999999, "system": 0.2075073625, "min": 0.10907753822, "max": 0.14637111622, "times": [ 0.12793721822, 0.13581961022, 0.12089280922000001, 0.14565912022, 0.10907753822, 0.12783631422, 0.11465643822, 0.11323994322, 0.12059301722, 0.14637111622, 0.14399747622, 0.11942810522000001, 0.12871012522, 0.12243102322, 0.11969281922000001, 0.13663670122000002 ], "exit_codes": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] } ] } ```