RuboCop Performance 1.6.0 has been released.
https://github.com/rubocop-hq/rubocop-performance/releases/tag/v1.6.0

This PR suppresss new RuboCop's offenses.

```consle
% bundle exec rubocop
(snip)

Offenses:

lib/active_record/connection_adapters/oracle_enhanced/database_statements.rb:45:39:
C: Performance/StartWith: Use String#start_with? instead of a regex
match anchored to the beginning of the string.
            if (name == "EXPLAIN") && sql =~ /^EXPLAIN/
                                      ^^^^^^^^^^^^^^^^^
lib/active_record/connection_adapters/oracle_enhanced/lob.rb:21:15: C:
Performance/EndWith: Use String#end_with? instead of a regex match
anchored to the end of the string.
              column.sql_type_metadata.sql_type =~ /LOB$/
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/active_record/connection_adapters/oracle_enhanced/oci_connection.rb:327:46:
C: Performance/StartWith: Use String#start_with? instead of a regex
match anchored to the beginning of the string.
            database = "/#{database}" unless database.match?(/^\//)
                                             ^^^^^^^^^^^^^^^^^^^^^^
spec/active_record/connection_adapters/oracle_enhanced/connection_spec.rb:183:58:
C: Performance/StartWith: Use String#start_with? instead of a regex
match anchored to the beginning of the string.
      params[:database] = "/#{params[:database]}" unless params[:database].match?(/^\//)
                                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

70 files inspected, 4 offenses detected
```

rsim#2019

This pull request restores Schema Dumper behavior changed by rsim#2019
because rails/rails#39365 does not intend to dump the default primary key configuration.

Related to rails/rails#39365
Follow up rsim#2019

This pull request restores Schema Dumper behavior changed by rsim#2019
because rails/rails#39365 does not intend to dump the default primary key configuration.

Related to rails/rails#39365
Follow up rsim#2019

This pull request restores Schema Dumper behavior changed by rsim#2019
because rails/rails#39365 does not intend to dump the default primary key configuration.

To avoid hash creation every time, it has been frozen and saved as a
constant.

Related to rails/rails#39365
Follow up rsim#2019
Refer http://code.jeremyevans.net/presentations/rubykaigi2019/index.html#58

This pull request restores Schema Dumper behavior changed by rsim#2019
because rails/rails#39365 does not intend to dump the default primary key configuration.

To avoid hash creation every time, it has been frozen and saved as a
constant.

Related to rails/rails#39365
Follow up rsim#2019
Refer http://code.jeremyevans.net/presentations/rubykaigi2019/index.html#58

Restore Schema Dumper behavior changed by #2019