Use mongo driver 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 #86 (12cb8a0) into main (d343bcd) will decrease coverage by 0.00%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
- Coverage   90.08%   90.08%   -0.01%     
==========================================
  Files           8        8              
  Lines        2593     2591       -2     
==========================================
- Hits         2336     2334       -2     
  Misses        257      257              

Impacted Files	Coverage Δ
lib/entities.js	95.51% <83.33%> (+0.02%)	⬆️
lib/batchVersions.js	83.22% <100.00%> (-0.06%)	⬇️
lib/documents.js	90.03% <100.00%> (-0.04%)	⬇️
lib/tokens.js	89.83% <100.00%> (-0.01%)	⬇️

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[dlongley]

Use of database.writeOptions in various places will also need to be addressed in any mongo driver 4 PRs.