Kinto

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**Internal changes**

- Upgrade kinto-admin to v1.25.0

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**Bug fixes**

- Prevent password to be modified on modification of accounts metadata (fixes 2058)
- Fix unexpected exception in ``/__version__`` endpoint
- Add ``Content-Type`` to default_cors_headers (refs 2220)
- Fix crash with non-allowed requests on ``__user_data__`` (fixes 2063)
- Fix multiple event listeners on READ action (fixes 1755)

**New features**

- Allow StatsD counter to be incremented by an arbitrary number

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**Bug fixes**

- Fix apparence of Admin notifications (fixes 2191)
- Fix intermittent failure when comparing timestamps in ConfigTest (fixes 2129)

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**Internal changes**

- Upgrade kinto-admin to v1.24.1

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**Internal changes**

- Upgrade kinto-admin to v1.24.0

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**Bug fixes**

- Fix cache heartbeat test (fixes 2107)
- Fix support of ``sqlalchemy.pool.NullPool`` for PostgreSQL backends.
The default ``pool_size`` of 25 is maintained on the default pool class
(``QueuePoolWithMaxBacklog``). When using custom connection pools, please
refer to SQLAlchemy documentation for default values.


**Internal changes**

- Remove dependency to kinto-redis in core tests