chore(deps): update dependency mongodb to v4.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mongodb	4.7.0 -> 4.8.1

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Release Notes

mongodb/node-mongodb-native

v4.8.1

Compare Source

v4.8.0

Compare Source

Features

• NODE-4078: allow comment with estimated doc count (#​3301) (bed1fe3)
• NODE-4267: support nested fields in type completion for UpdateFilter (#​3259) (1a9a44c)
• NODE-4294: mark queryable encryption options beta (#​3300) (4c07bbb)
• NODE-4301: remove shared lib experimental tags (#​3298) (3976783)

Bug Fixes

• NODE-4125: change stream resumability (#​3289) (aa5f97e)
• NODE-4262: make startSession work without a connection (#​3286) (89ad7c3)
• sync showExpandedEvents spec tests (#​3288) (cfe18f9)

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