Update Rust crate diesel to 1.4.8 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
diesel (source)	dependencies	minor	1.3.2 -> 1.4.8

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Release Notes

diesel-rs/diesel

v1.4.8

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Fixed

• Fixed a incompatibly between diesel and diesel_migrations when building both crates with cargos new resolver = "2" enabled. This change ensures compatibility with the upcomming 2021 rust edition.

v1.4.7

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Fixed

• Updated libsqlite3-sys to allow version 0.22
• Updated ipnetwork to allow version 0.18

v1.4.6

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Fixed

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

v1.4.5

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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

v1.4.4

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Fixed

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

v1.4.3

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Fixed

• Updated several dependencies
• Fixed an issue where the postgresql backend exploits implementation defined behaviour
• Fixed issue where rustdoc failed to build the documentation
• diesel_derives and diesel_migrations are updated to syn 1.0

v1.4.2

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Fixed

• Parenthesis are now inserted around all mathematical operations. This means
  that (2.into_sql() + 3) * 4 will correctly evaluate to 20 as expected.
  Previously we would generate SQL that evaluated to 14. This could even result
  in runtime errors if multiple types were involved (for example, interval * (integer + 1))

v1.4.1

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Fixed

• This release fixes a minor memory safety issue in SQLite. This bug would only
  occur in an error handling branch that should never occur in practice.

v1.4.0

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Fixed

• embed_migrations! will no longer emit an unused import warning
• Diesel now supports uuid 0.7 by adding the new feature flag uuidv07

Added

• Diesel CLI can be configured to error if a command would result in changes
  to your schema file by passing --locked-schema. This is intended for use
  in CI and production deploys, to ensure that the committed schema file is
  up to date.

• A helper trait has been added for implementing ToSql for PG composite types.
  See WriteTuple for details.

• Added support for MySQL's UNSIGNED TINYINT

• DatabaseErrorKind::SerializationFailure has been added, corresponding to
  SQLSTATE code 40001 (A SERIALIZABLE isolation level transaction failed to
  commit due to a read/write dependency on another transaction). This error is
  currently only detected on PostgreSQL.

• Diesel CLI can now generate completions for zsh and fish. See diesel completions --help for details.

• #[belongs_to] can now accept types that are generic over lifetimes (for
  example, if one of the fields has the type Cow<'a, str>). To define an
  association to such a type, write #[belongs_to(parent = "User<'_>")]

• Nullable<Text> now supports ilike expression on in PostgreSQL.

• diesel_manage_updated_at('table_name') is now available on SQLite. This
  function can be called in your migrations to create a trigger which
  automatically sets the updated_at column, unless that column was updated in
  the query.

Changed

• Diesel's derives now require that extern crate diesel; be at your crate root
  (e.g. src/lib.rs or src/main.rs)

• Tinyint has been renamed to TinyInt and an alias has been created from Tinyint to TinyInt.

• The minimal officially supported rustc version is now 1.31.0

v1.3.3

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Fixed

• Fixed an issue that occurred with MySQL 8.0 when calling .execute or
  .batch_execute with a single query that returned a result set (such as our
  SELECT 1 health check in r2d2).

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