Update tj-actions/bumpversion action to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tj-actions/bumpversion	action	major	v7.1 -> v8.4

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Release Notes

tj-actions/bumpversion

v8.4

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v8.3

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v8.2

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Merged pull requests:

• Upgraded to #​38 (jackton1)
• Update tj-actions/verify-changed-files action to v5 #​37 (renovate[bot])

v8.1

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Implemented enhancements:

• Support repos without an existing tag #​25

Merged pull requests:

• Configure Renovate #​36 (renovate[bot])
• Return the new tag each time an initial release is made. #​35 (jackton1)
• Bump alpine from 3.13.1 to 3.13.2 #​34 (dependabot-preview[bot])
• Update entrypoint.sh #​32 (jackton1)
• Update sync-release-version.yml #​30 (jackton1)
• Upgraded to v8 #​29 (jackton1)

v7.2

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Merged pull requests:

• Ignore exit code #​23 (jackton1)
• Bump alpine from 3.13.0 to 3.13.1 #​22 (dependabot-preview[bot])
• Bump alpine from 3.12 to 3.13.0 #​20 (dependabot-preview[bot])
• Upgraded to v7.1 #​19 (jackton1)

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