Update minimum docker compose requirement

[JannKleen]

Closes #3070

docker compose down is now required in https://github.com/getsentry/self-hosted/blob/master/install/upgrade-clickhouse.sh#L27.
Here is the corresponding docker compose Changelog: https://docs.docker.com/compose/release-notes/#bug-fixes-and-enhancements-19

I was running the install script using docker compose v2.18.1, and the install failed with:

 Container sentry-self-hosted-clickhouse-1  Running
sentry-self-hosted-clickhouse-1   clickhouse-self-hosted-local   "/entrypoint.sh"    clickhouse          4 minutes ago       Up 31 seconds (healthy)   8123/tcp, 9000/tcp, 9009/tcp
unknown command "clickhouse" for "docker compose down"
Error in install/upgrade-clickhouse.sh:23.
'$dc down clickhouse' exited with status 1
-> ./install.sh:main:25
--> install/upgrade-clickhouse.sh:source:23

Looks like you've already sent this error to us, we're on it :)

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.01%. Comparing base (6917e39) to head (4397640).

❗ Current head 4397640 differs from pull request most recent head faa51af

Please upload reports for the commit faa51af to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3078   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files           3        3           
  Lines         203      203           
=======================================
  Hits          201      201           
  Misses          2        2           

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[hubertdeng123]

The README will also need to be updated. Would you be able to make that change?

[JannKleen]

@hubertdeng123 Thanks, good catch, I changed the version in the README.