[ruby] Update all Bundler dependencies (2022-06-30)

[depfu[bot]]

This is your monthly update of all Bundler dependencies. Please take a good look at what changed and the test results before merging this pull request.

What changed?

↗️ rack-test (indirect, 1.1.0 → 2.0.2, major) · Repo · Changelog · Diff

↗️ minitest (indirect, 5.15.0 → 5.16.1, minor) · Repo · Changelog · Diff

✳️ pg (1.3.5 → 1.4.1, minor) · Repo · Changelog · Diff

✳️ rack-timeout (0.6.2 → 0.6.3, minor) · Repo · Changelog · Diff

✳️ rubocop (1.30.1 → 1.31.1, minor) · Repo · Changelog · Release · Diff

✳️ rubocop-rails (2.14.2 → 2.15.1, minor) · Repo · Changelog · Release · Diff

✳️ selenium-webdriver (4.2.1 → 4.3.0, minor) · Repo

↗️ unicode-display_width (indirect, 2.1.0 → 2.2.0, minor) · Repo · Changelog · Diff

↗️ zeitwerk (indirect, 2.5.4 → 2.6.0, minor) · Repo · Changelog · Diff

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