HPCC-10630 Upgrade to dgrid 0.3.12

Fixes HPCC-10630

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5268 from GordonSmith/HPCC-10630

HPCC-10630 Upgrade to dgrid 0.3.12

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>