Only when the eviction policy is LRU, the data access_time is updated

[SimFG]

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[codecov]

Codecov Report

Merging #214 (35f11fe) into dev (211949a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #214      +/-   ##
==========================================
+ Coverage   92.53%   92.55%   +0.01%     
==========================================
  Files          47       47              
  Lines        1500     1504       +4     
==========================================
+ Hits         1388     1392       +4     
  Misses        112      112              

Impacted Files	Coverage Δ
gptcache/adapter/adapter.py	98.11% <100.00%> (ø)
gptcache/manager/data_manager.py	88.61% <100.00%> (+0.09%)	⬆️
gptcache/manager/eviction.py	86.66% <100.00%> (+1.48%)	⬆️