Bump diesel from 1.4.3 to 1.4.6 in /backend

[dependabot[bot]]

Bumps diesel from 1.4.3 to 1.4.6.

Release notes

Sourced from diesel's releases.

1.4.6

Fixed

• Fixed a use-after-free issue in the QueryableByName implementation of our Sqlite backend
• Updated several dependencies

1.4.5

Fixed

• Update several dependencies
• Fixed an issue where transactions that would fail to commit would leave the connection in a broken non-committed non-rolled-back state.
• Fix a bug that result in leaking sockets/file descriptors on failed connection attempts for postgresql
• Fix an incompatibility with newer libmysqlclient versions
• Remove some potential harmful usages of mem::uninitialized

1.4.4

Fixed

• Update several dependencies
• Fixed a bug with printing embedded migrations

As part of this release also updated versions of migration_internals and migration_macros are published.

Changelog

Sourced from diesel's changelog.

[1.4.6] - 2021-03-05

Fixed

• Fixed a use-after-free issue in the QueryableByName implementation of our Sqlite backend
• Updated several dependencies

[1.4.5] - 2020-06-09

Fixed

• Update several dependencies
• Fixed an issue where transactions that would fail to commit would leave the connection in a broken non-committed non-rolled-back state.
• Fix a bug that result in leaking sockets/file descriptors on failed connection attempts for postgresql
• Fix an incompatibility with newer libmysqlclient versions
• Remove some potential harmful usages of mem::uninitialized

[1.4.4] - 2020-03-22

Fixed

• Update several dependencies
• Fixed a bug with printing embeded migrations

Commits

• b0c8e99 Release diesel 1.4.6
• ae72835 Merge pull request #2663 from weiznich/bugfix/fix_use_after_free
• cead1a3 Downgrade max bigdecimal version as the new version is incompatible
• 2a612f0 Run cargo fmt
• d699f14 Bump some dependencies
• d219211 Address review comments
• d413328 Fix a use-after-free bug in our Sqlite backend
• 8e9e639 More fixes for mysql setup
• 453cfb8 Remove clippy from ci on release branch
• d856d35 Fix mysql instalation on macos
• Additional commits viewable in compare view

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