Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.15...4.17.19

)

Signed-off-by: dependabot[bot] <support@github.com>

This removes a select across the whole table by ensuring we generate a media ID which is highly unlikely to conflict with the database.

Add docs for host delegation

well-known 3b: port shoud be included in the Host header

Allow skipping user check in upload_controller.StoreDirect

Fixes https://github.com/turt2live/matrix-media-repo/issues/188

And then stripped from the serverName when checking the cert

Put IPv6 between brackets since we happen the port

The new parameter `filterUserDuplicates` is set to true
everywhere else except in the import_synapse call. This
ensures direct duplicates from the same user will get
stored in an import from Synapse situation when migrating
to the mediarepo.

Closes #241

To prevent accidents like what happened in c30170ff

They're already gzipped going in, just need to be unzipped coming out.