upgrade sqlite3 gem for rails 3 compatibility

refs CNVS-10649

it's still the same gem; see
 https://groups.google.com/forum/#!topic/sqlite3-ruby/i1xgf2b0SHU

Change-Id: I2d5414723fed1c20145138110e9756e39250f9e9
Reviewed-on: https://gerrit.instructure.com/29069
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>