Fix the eviction error

[SimFG]

No description provided.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SimFG

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [SimFG]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

Merging #440 (21f3219) into dev (c0c626b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #440   +/-   ##
=======================================
  Coverage   93.89%   93.89%           
=======================================
  Files          90       90           
  Lines        3325     3327    +2     
=======================================
+ Hits         3122     3124    +2     
  Misses        203      203           

Impacted Files	Coverage Δ
gptcache/manager/eviction/manager.py	100.00% <100.00%> (ø)
gptcache/manager/eviction/memory_cache.py	90.90% <100.00%> (ø)