Update pg requirement from >= 0.18, <= 1.5 to >= 0.18, <= 1.6

[dependabot[bot]]

Updates the requirements on pg to permit the latest version.

Changelog

Sourced from pg's changelog.

v1.5.1 [2023-04-24] Lars Kanis lars@greiz-reinsdorf.de

• Don't overwrite flags of timestamp coders. #524 Fixes a regression in rails: rails/rails#48049

v1.5.0 [2023-04-24] Lars Kanis lars@greiz-reinsdorf.de

Enhancements:

• Better support for binary format:
  • Extend PG::Connection#copy_data to better support binary transfers #511
  • Add binary COPY encoder and decoder:
    • PG::BinaryEncoder::CopyRow
    • PG::BinaryDecoder::CopyRow
  • Add binary timestamp encoders:
    • PG::BinaryEncoder::TimestampUtc
    • PG::BinaryEncoder::TimestampLocal
    • PG::BinaryEncoder::Timestamp
  • Add PG::BinaryEncoder::Float4 and Float8
  • Add binary date type: #515
    • PG::BinaryEncoder::Date
    • PG::BinaryDecoder::Date
  • Add PG::Result#binary_tuples #511 It is useful for COPY and not deprecated in that context.
  • Add PG::TextEncoder::Bytea to BasicTypeRegistry #506
• Ractor support: #519
  • Pg is now fully compatible with Ractor introduced in Ruby-3.0 and doesn't use any global mutable state.
  • All type en/decoders and type maps are shareable between ractors if they are made frozen by Ractor.make_shareable.
  • Also frozen PG::Result and PG::Tuple objects can be shared.
  • All frozen objects (except PG::Connection) can still be used to do communication with the PostgreSQL server or to read retrieved data.
  • PG::Connection is not shareable and must be created within each Ractor to establish a dedicated connection.
• Use keyword arguments instead of hashes for Coder initialization and #to_h. #511
• Add PG::Result.res_status as a class method and extend Result#res_status to return the status of self. #508
• Reduce the number of files loaded at require 'pg' by using autoload. #513 Previously stdlib libraries date, json, ipaddr and bigdecimal were static dependencies, but now only socket is mandatory.
• Improve garbage collector performance by adding write barriers to all PG classes. #518 Now they can be promoted to the old generation, which means they only get marked on major GC.
• New method PG::Connection#check_socket to check the socket state. #521
• Mark many internal constants as private. #522
• Update Windows fat binary gem to OpenSSL-3.1.0.

Bugfixes:

• Move nfields-check of stream-methods after result status check #507 This ensures that the nfield-check doesn't hide errors like statement timeout.

Removed:

• Remove deprecated PG::BasicTypeRegistry.register_type and co. [Part of #519](https://github.com/ged/ruby-pg/commit/2919ee1a0c6b216e18e1d06c95c2616ef69d2f97)

... (truncated)

Commits

• cc110f5 Update History for pg-1.5.1
• 1db1eed Merge branch 'master' of github.com:ged/ruby-pg
• c9b1660 Merge pull request #525 from larskanis/fix-524
• 0e74d2b Bump VERSION to 1.5.1
• 77bd5e8 Don't overwrite flags of timestamp coders
• 70460e3 Update History.md
• 3db190e Update release date for pg-1.15.0
• 8e859ce Merge branch 'master' of github.com:ged/ruby-pg
• 68ac787 Merge branch 'check_connection'
• 0ea7a94 Merge pull request #522 from larskanis/private-const
• Additional commits viewable in compare view

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[ivgiuliani]

@dependabot rebase