Update testcontainers requirement from 0.9 to 0.12

[dependabot-preview]

Updates the requirements on testcontainers to permit the latest version.

Changelog

Sourced from testcontainers's changelog.

[0.12.0] - 2021-01-27

Added

• Allow custom version for postgres image
• Remove derivative dependency
• OrientDB image
• Zookeeper image

Changed

• Move port mapping logic to RunArgs instead of each Image.

[0.11.0] - 2020-09-30

Added

• Docker::run_with_args method. This allows naming a container and assigning it to a specific docker network. The docker network will be created if it doesn't exist yet. Once the client is dropped, the network will be removed again if it has previously been created. A network that already existed will not be removed.
• Address-type argument to coblox/bitcoin-core Image. We are setting bech32 as a default here. This is different from the default of bitcoind.

Fixed

• Block the thread until containers have been successfully removed. Previously, this was done in a fire-and-forget way and hence led to containers not being removed in certain situations.

Changed

• MSRV is now 1.41.0

[0.10.0] - 2020-08-20

Added

• Mongo image.
• Support for the fallbackfee argument for the bitcoin-core image.
• Ability to customize the entrypoint used by the image.
• Ability to start a container once stopped.

Changed

• MSRV bumped to 1.36 from 1.32.
• Change postgres image authentication POSTGRES_HOST_AUTH_METHOD rather than username and password.
• Bumped bitcoin-core default tag to 0.20.0.

[0.9.1] - 2020-03-24

... (truncated)

Commits

• d02050c Merge pull request #249 from testcontainers/release/0.12.0
• fcbf609 Update CHANGELOG and manifest for new release
• e1e5f84 Merge #238
• 86f0393 Merge #241
• 65c73b5 Update redis requirement from 0.18 to 0.19
• 6fc4d26 improve test
• 8294459 [images] Allow custom version for Postgres
• 7cc72c4 Merge #237
• 4b01fa5 Update rand requirement from 0.7 to 0.8
• 2c301e9 Merge #236
• Additional commits viewable in compare view

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