Bump futures from 0.3.17 to 0.3.21 in /src/agent

[dependabot]

Bumps futures from 0.3.17 to 0.3.21.

Release notes

Sourced from futures's releases.

0.3.21

• Fix potential data race in FlattenUnordered that introduced in 0.3.20 (#2566)

0.3.20

• Fix stacked borrows violations when -Zmiri-tag-raw-pointers is enabled. This raises MSRV of futures-task to 1.45. (#2548, #2550)
• Change FuturesUnordered to respect yielding from future (#2551)
• Add StreamExt::{flatten_unordered, flat_map_unordered} (#2083)

0.3.19

• Remove unstable read-initializer feature (#2534)
• Fix panic in FuturesUnordered (#2535)
• Fix compatibility issue with FuturesUnordered and tokio's cooperative scheduling (#2527)
• Add StreamExt::count (#2495)

0.3.18

• Fix unusable Sink implementation on stream::Scan (#2499)
• Make task::noop_waker_ref available without std feature (#2505)
• Add async LineWriter (#2477)
• Remove dependency on proc-macro-hack. This raises MSRV of utility crates to 1.45. (#2520)

Changelog

Sourced from futures's changelog.

0.3.21 - 2022-02-06

• Fix potential data race in FlattenUnordered that introduced in 0.3.20 (#2566)

0.3.20 - 2022-02-06

NOTE: This release has been yanked due to a bug fixed in 0.3.21.

• Fix stacked borrows violations when -Zmiri-tag-raw-pointers is enabled. This raises MSRV of futures-task to 1.45. (#2548, #2550)
• Change FuturesUnordered to respect yielding from future (#2551)
• Add StreamExt::{flatten_unordered, flat_map_unordered} (#2083)

0.3.19 - 2021-12-18

• Remove unstable read-initializer feature (#2534)
• Fix panic in FuturesUnordered (#2535)
• Fix compatibility issue with FuturesUnordered and tokio's cooperative scheduling (#2527)
• Add StreamExt::count (#2495)

0.3.18 - 2021-11-23

NOTE: This release has been yanked. See #2529 for details.

• Fix unusable Sink implementation on stream::Scan (#2499)
• Make task::noop_waker_ref available without std feature (#2505)
• Add async LineWriter (#2477)
• Remove dependency on proc-macro-hack. This raises MSRV of utility crates to 1.45. (#2520)

Commits

• fc1e325 Release 0.3.21
• 20279eb FlattenUnordered: improve wakers behavior (#2566)
• 75dca5a Fix MSRV in futures-task readme
• 55281c8 Release 0.3.20
• 591b982 Redefine executor and compat modules in futures crate (#2564)
• 94b508b Basic StreamExt::{flatten_unordered, flat_map_unordered} impls (#2083)
• dca16fa Do not auto-create PR on fork
• a9795a9 Automatically creates PR when no_atomic_cas.rs needs to be updated
• 4841888 Update comments in build scripts
• 85706b6 Clean up ci/no_atomic_cas.sh
• Additional commits viewable in compare view

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