mongodb-driver updated from 3.8.1 to 3.12.11

[v1k1nghawk]

Based on performance assumptions, the mongodb-driver should be updated from version 3.8.1 to version 3.12.11. The aggregated performance gain equals to 9.62%.

Test's Methodology: 10 cold runs with mongodb-driver v3.8.1, 10 cold runs with mongodb-driver v3.12.11

Test's Setup:
client host: 4 vcpus, 16 Gb RAM, Ubuntu 20.04.1 x86_64
client command to load:

java -jar "./target/socialite-0.0.1-SNAPSHOT.jar" load --users "100000" --maxfollows "200" --messages "100" --threads "64" config.yml

client command to run:

java -jar "./target/socialite-0.0.1-SNAPSHOT.jar" benchmark --total_users "500" --active_users "200" --concurrency "64" --session_duration "10" --target_rate "2000" --follow_pct "2" --unfollow_pct "1" --read_timeline_pct "50" --scroll_timeline_pct "41" --send_content_pct "4" --fof_agg_pct "1" --fof_query_pct "1" --duration "120" config.yml

server host: 4 vcpus, 16 Gb RAM, Ubuntu 20.04.1 x86_64
server MongoDB: v6.0.2, 1-noded ReplicaSet

Test's Results:

mean rate, calls/second	avg performance gain, % ((sum of v3.12.11 results / sum of v3.8.1 results)*100 - 100)
follow	11.97
friends_of_friends_agg	7.01
friends_of_friends_query	7.05
get_follower_count	10.01
get_followers	10.01
read_timeline	9.73
scroll_timeline	10.01
send_content	10.79
unfollow	10.01