Update ffi requirement from ~> 1.9.3 to >= 1.9.3, < 1.16.0

[dependabot[bot]]

Updates the requirements on ffi to permit the latest version.

Changelog

Sourced from ffi's changelog.

1.15.5 / 2022-01-10

Fixed:

• Fix long double argument or return values on 32bit i686. #849
• FFI::ConstGenerator: avoid usage of the same binary file simultaneously. #929

Added:

• Add Windows fat binary gem for Ruby-3.1

Removed:

• Remove Windows fat binary gem for Ruby < 2.4

1.15.4 / 2021-09-01

Fixed:

• Fix build for uClibc. #913
• Correct module lookup when including ffi-module gem. #912

Changed:

• Use ruby code of the ffi gem in JRuby-9.2.20+. #915

1.15.3 / 2021-06-16

Fixed:

• Fix temporary packaging issue with libffi. #904

1.15.2 / 2021-06-16

Added:

• Add support for Windows MINGW-UCRT build. #903
• Add /opt/homebrew/lib/ to fallback search paths to improve homebrew support. #880 #882

Changed:

• Regenerate types.conf for FreeBSD12 aarch64. #902

1.15.1 / 2021-05-22

Fixed:

• Append -pthread to linker options. #893
• Use arm or aarch64 to identify Apple ARM CPU arch. #899
• Allow overriding gcc with the CC env var in const_generator.rb and struct_generator.rb. #897

... (truncated)

Commits

• 4b1c43a Add ffi-1.15.5 to CHANGELOG
• 36a5681 Bump VERSION to 1.15.5
• c438e36 Merge pull request #929 from maierru/fix/shared_tmp_inside_docker
• 9552253 prevent usage same binary file simultaneously
• 517b658 Add support for x64-mingw-ucrt aka RubyInstaller-3.1.0-x64 and parallel build
• 315d66e Merge pull request #919 from xtkoba/issue849
• 0ef7a9d Keep LONGDOUBLE_ADJ >= sizeof(long double)
• 7429c5a Bump VERSION to 1.15.4 and add CHANGELOG entry
• cd0db90 Merge pull request #913 from xtkoba/uclibc
• 05eac54 Fix build for uClibc
• Additional commits viewable in compare view

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