Update testcontainers dep to use crate.io dep instead of a specific git sha

[elizabethengelman]

trafficstars

We're using testcontainers for the ledger emulator tests, and have some dependency mismatches that prevented us from using a tagged release.

• for testcontainers 0.16.0 we have a dependency mismatch with the version of the quote crate: testcontainers requires the quote crate at version ^1.0.35, but soroban-env-host is using 1.0.33
• for previous testcontainers releases, there are mismatches between more recent versions of bollard-stubs (need to do some more investigation to remember exactly what the issue was)

Solution ideas:

• loosen requirements for quote in soroban-env-host and try testcontainers 0.16.0 (or even 0.17.0)

[leighmcculloch]

+1 we have loosened some dependencies in env recently and could do same with quote I think.