Update parking_lot requirement from 0.8.0 to 0.9.0

[dependabot-preview]

Updates the requirements on parking_lot to permit the latest version.

Changelog

Sourced from parking_lot's changelog.

parking_lot 0.9.0, parking_lot_core 0.6.0, lock_api 0.3.1 (2019-07-14)

• The minimum supported rust version (MSRV) is now 1.32. This was primarily
  increased for testing with the latest rand crate. Rust 1.31 may continue to
  work for normal use of these releases.
• Re-export lock_api (0.3.1) from parking_lot (#150)
• Removed (non-dev) dependency on rand crate for fairness mechanism, by
  including a simple xorshift PRNG in core (#144)
• Android now uses the futex-based ThreadParker. (#140)
• Fixed CloudABI ThreadParker. (#140)
• Fix race condition in lock_api::ReentrantMutex (da16c2c7)

lock_api 0.3.0 (2019-07-03, yanked)

• Use NonZeroUsize in GetThreadId::nonzero_thread_id (#148)
• Debug assert lock_count in ReentrantMutex (#148)
• Tag as unsafe and document some internal methods (#148)
• This release was yanked due to a regression in ReentrantMutex (da16c2c7)

parking_lot 0.8.1 (2019-07-03, yanked)

• Re-export lock_api (0.3.0) from parking_lot (#150)
• This release was yanked from crates.io due to unexpected breakage (#156)

parking_lot 0.8.0, parking_lot_core 0.5.0, lock_api 0.2.0 (2019-05-04)

• Fix race conditions in deadlock detection.
• Support for more platforms by adding ThreadParker implementations for
  Wasm, Redox, SGX and CloudABI.
• Drop support for older Rust. parking_lot now requires 1.31 and is a
  Rust 2018 edition crate (#122).
• Disable the owning_ref feature by default.
• Fix was_last_thread value in the timeout callback of park() (#129).
• Support single byte Mutex/Once on stable Rust when compiler is at least
  version 1.34.
• Make Condvar::new and Once::new const fns on stable Rust and remove
  ONCE_INIT (#134).
• Add optional Serde support (#135).

parking_lot 0.7.1 (2019-01-01)

• Fixed potential deadlock when upgrading a RwLock.
• Fixed overflow panic on very long timeouts (#111).

parking_lot 0.7.0, parking_lot_core 0.4.0 (2018-11-26)

• Return if or how many threads were notified from Condvar::notify_*

parking_lot 0.6.3 (2018-07-18)

... (truncated)

Commits

• 1dbf100 Update changelog date
• 58f9183 Merge pull request #159 from dekellum/stage-0.9.0
• b23f028 change log typo
• fd210ae change log for MSRV 1.32 merge
• f7551d1 Merge branch 'master' into stage-0.9.0
• e26269a Merge pull request #160 from dekellum/dev-rand-0.7
• 309ef0e Merge branch 'master' into stage-0.9.0
• 91d56ab increase MSRV to 1.32 (for rand 0.7 dev dependency)
• 5539a58 upgrade rand (dev) dep to 0.7
• f455e48 Merge pull request #161 from Amanieu/appveyor
• Additional commits viewable in compare view

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[fubuloubu]

Could this be reverted? This conflicts with rocksdb from parity-common, which is unlikely to be resolved for a little while: paritytech/parity-common#88

Error message:

error: failed to select a version for `libc`.                                                                                            
    ... required by package `parking_lot_core v0.6.0`                                                                                    
    ... which is depended on by `parking_lot v0.9.0`                                                                                     
    ... which is depended on by `web3 v0.8.0 (https://github.com/tomusdrw/rust-web3#bc5584e0)`
    ... which is depended on by `substrate-plasma-cash v1.0.0 (/home/bryant/Dropbox/work/Zatoichi/substrate-plasma-cash)`
versions that meet the requirements `^0.2.55` are: 0.2.60, 0.2.59, 0.2.58, 0.2.57, 0.2.56, 0.2.55

all possible versions conflict with previously selected packages.

  previously selected package `libc v0.2.54`
    ... which is depended on by `atty v0.2.11`
    ... which is depended on by `clap v2.32.0`
    ... which is depended on by `bindgen v0.47.3`
    ... which is depended on by `librocksdb-sys v5.18.3`
    ... which is depended on by `rocksdb v0.11.0`
    ... which is depended on by `kvdb-rocksdb v0.1.4 (https://github.com/paritytech/parity-common?rev=b0317f649ab2c665b7987b8475878fc4d2e1f81d#b0317f64)`

[tomusdrw]

@fubuloubu Seems there is only one PR that got merged (couple of minutes ago) on top of this change, so maybe pin a particular commit before that PR or better just use the crates.io version (which I believe does not contain this change).

Also we (the Parity team) bump parking_lot periodically in all our crates, but indeed it may take some time cause it requires quite a lot of coordinated effort.

[fubuloubu]

Okay, I will do that for now, and I should expect the rest of the libraries to see updates in the coming week or so?

[tomusdrw]

@fubuloubu I can't promise this, rust-web3 was only updated because of dependabot, since there is nothing we actually need from the latest version it might take quite a while (rather weeks than days) until it's updated at all.