bump loggregatorlib

b8f5328 Use fake store adapter from storeadapter package
3d1def3 fix for go vet
1e7c45e Consolidate MockLoggregatorClient copies; prefer Expect over Ω
0480a10 update fake metric sender reference
766bc06 Emit loggregatorclient metrics over dropsonde
523d25d Ginkgo-ify loggregatorclient tests

automatic promotion by GoCD workflow Loggregatorlib/114 > UnitTests/1 > UnitTests
Use dropsonde instead of varz to emit dea logging agent metrics

[#77046142]

Signed-off-by: John Tuley <jtuley@pivotal.io>