Remove obsolete ruby-oci8 2.0.3 TIMESTAMP patch

[yahonda]

Summary

• Remove lib/plsql/oci8_patches.rb which patched a TIMESTAMP fractional seconds bug specific to ruby-oci8 2.0.3 (added in 2009, fixed upstream in 2.0.4)
• Remove the corresponding require "plsql/oci8_patches" from oci_connection.rb
• Bump the runtime minimum version check from 2.0.3 to 2.1.0 to match the gemspec ~> 2.1 constraint
• Use Gem::Version for version comparison
• Update README to reflect current requirements

Test plan

• Verify CI passes (the patch was dead code -- never activated with ruby-oci8 ~> 2.1)

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Removes a legacy ruby-oci8 2.0.3-specific TIMESTAMP fractional seconds patch and aligns the runtime ruby-oci8 minimum version check with the project’s stated dependency range.

Changes:

• Delete the obsolete lib/plsql/oci8_patches.rb monkey patch (ruby-oci8 2.0.3 only).
• Remove the corresponding require "plsql/oci8_patches" from the OCI connection loader.
• Increase the runtime minimum ruby-oci8 version check from 2.0.3 to 2.1.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
lib/plsql/oci8_patches.rb	Removes a legacy monkey patch targeting ruby-oci8 2.0.3.
lib/plsql/oci_connection.rb	Drops patch require and bumps minimum ruby-oci8 version check to 2.1.0.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

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