Bump puppet's wikimetrics module to handle pool_size setting

Since database connection pool sizes have been made configurable [1]
for Wikimetrics, Wikimetrics relies on the corresponding
{WIKIMETRICS,MEDIAWIKI}_POOL_SIZE keys being set up properly in
wikimetrics' database configuration. So we bump puppet's wikimetrics
module, as current master of it takes care of configuring pool sizes.

[1] b46fdf9902e96fb8fbbc9a02cb85a04182a69fa7 of analytics/wikimetrics

Bug: 68825
Change-Id: Ie74865804521de38b393f4c0c0d1d2d19965978e
Merge "Bump puppet's wikimetrics module to handle pool_size setting"