Bump metadata cache back down

[dstuebe]

The cache size was too large - needed too much heap.
Bump the cache size back down.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@d9ddb49). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #102   +/-   ##
=========================================
  Coverage          ?   89.65%           
  Complexity        ?      719           
=========================================
  Files             ?       56           
  Lines             ?     2677           
  Branches          ?      176           
=========================================
  Hits              ?     2400           
  Misses            ?      192           
  Partials          ?       85

Impacted Files	Coverage Δ	Complexity Δ
...java/com/upserve/uppend/lookup/LookupMetadata.java	98.47% <ø> (ø)	30 <0> (?)

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