fix(alert): prevent content from overflowing alert (backport)

[ashleyryan]

• flexbox has some quirks with overflow
• setting min-width: 0 prevents the content from overflowing

fixes #137

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• [ ] Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
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What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

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• [ ] No

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:tada: This PR is included in version 5.8.1 :tada:

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[github-actions[bot]]

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