Bump bcrypt from 3.1.13 to 3.1.16

[dependabot-preview[bot]]

Bumps bcrypt from 3.1.13 to 3.1.16.

Changelog

Sourced from bcrypt's changelog.

3.1.16 Sep 3 2020

• Fix compilation on FreeBSD. [GH #234]

3.1.15 July 21 2020

• Remove GVL optimization. Apparently it breaks things [GH #230]

3.1.14 July 21 2020

• Start calibration from the minimum cost supported by the algorithm [GH #206 by @sergey-alekseev]

Commits

• abff57d bump version / fix changelog
• 32469cc Merge pull request #234 from michelboaventura/fix_crypt_r
• 77fa85d Fix crypt_r definition
• 9f3fb05 Merge pull request #231 from agrare/add_ruby_2_7_to_test_matrix
• cedc403 Remove Gemfile.lock
• ef6efb2 bump version
• 7460f0b Install a recent bundler version
• fbb89d7 Revert "unlock the gvl when calculating hashes / salts"
• 8f99fc1 Add ruby 2.7 to the test matrix
• a4528cf Merge pull request #227 from nathanKramer/fix/valid-hash-return-type
• Additional commits viewable in compare view

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