Bump nio4r from 2.5.1 to 2.5.8

[dependabot-preview]

Bumps nio4r from 2.5.1 to 2.5.8.

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

• 68ab63a Bump patch version.
• e6ea675 Remove guard from Gemfile.
• 942623a Fix incorrect return types. Fixes #275.
• 05532a5 Patch version bump.
• 1242bf6 Allow usage of native extension by default.
• 3d1a49e Don't try to link universal extension.
• 9192212 Patch version bump.
• 90d9599 Suggest kqueue on OSX if >= 10.12.2
• cc6e0f7 Avoid requiring linux kernel headers to be present
• 3c80de0 CI: Remove the macos-11.0 target, for now
• Additional commits viewable in compare view

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