Increase time limit for 25-cache-service.t a little

[kraih]

Even on a very fast machine i can't get below 103 seconds for this test. And it's been like this since at least January.

Progress: https://progress.opensuse.org/issues/102221

[codecov]

Codecov Report

Merging #4359 (4c46b9b) into master (2fdc772) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4359   +/-   ##
=======================================
  Coverage   97.94%   97.94%           
=======================================
  Files         371      371           
  Lines       33705    33705           
=======================================
  Hits        33012    33012           
  Misses        693      693           

Impacted Files	Coverage Δ
t/25-cache-service.t	100.00% <100.00%> (ø)

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