Switch to br mongodb 4 rc.

[aljones15]

Awaits:

• MAJOR: Upgrade to node mongodb driver 4 bedrock-mongodb#92

Todo:

• Test with auth turned on in mongo server 6.

[codecov-commenter]

Codecov Report

Merging #106 (b5dae2a) into main (6034a0b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #106   +/-   ##
=======================================
  Coverage   83.76%   83.76%           
=======================================
  Files          12       12           
  Lines        2261     2261           
=======================================
  Hits         1894     1894           
  Misses        367      367           

Impacted Files	Coverage Δ
lib/slcs.js	86.36% <100.00%> (ø)

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