Bump nio4r from 2.5.1 to 2.5.5

[dependabot-preview]

Bumps nio4r from 2.5.1 to 2.5.5.

Changelog

Sourced from nio4r's changelog.

2.5.5 (2021-02-05)

• #256 Use libev 4.33, featuring experimental io_uring support. ([@jcmfernandes])

• #260 Workaround for ARM-based macOS Ruby: Use pure Ruby for M1, since the native extension is crashing on M1 (arm64). ([@jasl])

• #252 JRuby: Fix javac -Xlint warnings ([@headius])

2.5.4 (2020-09-16)

• #251 Intermittent SEGV during GC. ([@boazsegev])

2.5.3 (2020-09-07)

• #241 Possible bug with Ruby >= 2.7.0 and GC.compact. ([@boazsegev])

2.5.2 (2019-09-24)

• #220 Update to libev-4.27 & fix assorted warnings. ([@ioquatix])

• #225 Avoid need for linux headers. ([@ioquatix])

2.4.0 (2019-07-07)

• #211 Enable KQUEUE on macOS 10.14+. ([@ioquatix])

• Bump minimum supported Ruby to 2.3. ([@ioquatix])

• Assorted fixes for TruffleRuby & JRuby. ([@eregon], [@olleolleolle]) Possible bug with Ruby >= 2.7.0 and GC.compact

• Update libev to v4.25. ([@ioquatix])

... (truncated)

Commits

• e45fac5 Patch version bump.
• 41469f6 Be more explicit with why pure? is being used.
• 4338c5d Workaround for ARM-based macOS bundled Ruby
• 4111b1c Allow pure Ruby and Java NIO::Selector to be initialized with nil
• 17155b9 Declare linuxaio and io_uring experimental
• de5e5f9 linuxaio is actually only supported on linux kernel 4.19+
• 9cecf14 Define EV_USE_IOURING if header is present
• c4fc499 Patch libev and add support for linuxaio and io_uring
• a84bcf2 Upgrade libev to verion 4.33
• 9798557 Add ruby 3.0 to the README
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #296.