dependency: bump bootsnap from 1.7.5 to 1.7.6

Bumps bootsnap from 1.7.5 to 1.7.6.

Changelog

Sourced from bootsnap's changelog.

1.7.6

• Fix reliance on set to be required.
• Fix Encoding::UndefinedConversionError error for Rails applications when precompiling cache. (#364)

Commits

• 4d02f87 Release 1.7.6
• 0dbb866 Fix reliance on set to be required.
• 6c89cf9 Merge pull request #364 from ngan/fix-encoding-for-rails-apps
• c6ecffc Update changelog
• d705a40 Set encoding for write pipe
• ba68d31 Merge pull request #361 from psparrow/master
• f509421 Add prepend and append to ChangeObserver
• See full diff in compare view

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