Update bigdecimal requirement from ~> 1.4 to >= 1.4, < 4.0

[dependabot[bot]]

Updates the requirements on bigdecimal to permit the latest version.

Release notes

Sourced from bigdecimal's releases.

v3.1.6

What's Changed

• Correctly computing loop iterations in BigDecimal#sqrt by @​z2-2z in ruby/bigdecimal#280
• Workaround for test-bundled-gems at ruby/ruby repo by @​hsbt in ruby/bigdecimal#283
• Add LICENSE file to gem files by @​oleksii-leonov in ruby/bigdecimal#282
• Refine test code related unsupported Ruby version by @​hsbt in ruby/bigdecimal#284

New Contributors

• @​z2-2z made their first contribution in ruby/bigdecimal#280
• @​oleksii-leonov made their first contribution in ruby/bigdecimal#282

Full Changelog: https://github.com/ruby/bigdecimal/compare/v3.1.5...v3.1.6

Changelog

Sourced from bigdecimal's changelog.

3.1.6

• Add LICENSE file to gem files GH-282

  @​oleksii-leonov

3.1.5

• Add .to_s('F') digit grouping for integer part GH-264

  @​cryptogopher

3.1.4

• Handle correctly #reminder with infinity. Fixes GH-187 GH-243

  @​mrzasa

3.1.3

• Adjust a local variable type to exponent. GH-223
• Remove checks for struct RRational and struct RComplex . GH-233
• Suppress macro redefinition warnings. GH-239

3.1.2

• Fix the maximum precision of the quotient. GH-220

  Reported by @​grk

3.1.1

• Fix the result precision of BigDecimal#divmod. GH-219

  Kenta Murata

3.1.0

• Improve documentation GH-209

  Burdette Lamar

• Let BigDecimal#quo accept precision. GH-214 [Bug #8826]

  Reported by Földes László

• Allow passing both float and precision in BigDecimal#div. GH-212 [Bug #8826]

  Reported by Földes László

... (truncated)

Commits

• 080f9b2 Bump up version to 3.1.6
• d90feaa Merge pull request #284 from ruby/drop-2-5-related-code
• b98e92f Merge pull request #282 from oleksii-leonov/patch-1
• ed0dd9f Refine test code related unsupported Ruby version
• 992c2c9 Add LICENSE file to gem files
• 3816e76 Merge pull request #283 from ruby/fix-test-bundled-gems-3-4
• a77d775 Don't use : for Windows platforms
• c25d93e BigDecimal.allocate is obsoleted too
• 2aab78b BigDecimal() is obsoleted today. We shouldn't test it
• 758fc62 We need to care assert_no_memory_leak too
• Additional commits viewable in compare view

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