Bump spring from 4.1.3 to 4.2.1

[dependabot[bot]]

Bumps spring from 4.1.3 to 4.2.1.

Changelog

Sourced from spring's changelog.

4.2.1

• Added Spring.connect_timeout and Spring.boot_timeout to allow to increase timeout for larger apps.
• Spring.connect_timeout now default to 5 seconds instead of 1.

4.2.0

• Added Spring.reset_on_env to define environment variables which should cause spring to reload when they change.
• Added Spring.spawn_on_env to define environment variables that should cause spring to start a distinct server.
• Better handle a case where the server could hang.

Commits

• c5987d5 Release 4.2.1
• 47ccb11 Merge pull request #712 from rails/configurable-timeouts
• d73d1db Allow to configure boot and connect timeout
• 2380451 Merge pull request #713 from rails/update-ci-matrix
• a0797de Update CI matrix
• 0029fc8 Merge pull request #711 from kpumuk/patch-1
• 58f73dc Fixed a small typo in the CHANGELOG.md
• cf107a5 Release 4.2.0
• dee2179 Merge pull request #709 from gmcgibbon/fix_ci
• fcea94c Remove incorrect version constraint
• Additional commits viewable in compare view

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