fix: relax version pinning of @pagerduty/backstage-plugin-common

[tamimkh]

Description

In order to reduce the amount changes required to update dependent packages
relax the version requirements for @pagerduty/backstage-plugin-common

Issue number: N/A

Type of change

• New feature (non-breaking change which adds functionality)
• Fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• Changes generate no new warnings
• PR title follows conventional commit semantics

If this is a breaking change 👇

• I have documented the migration process
• I have implemented necessary warnings (if it can live side by side)

Acknowledgement

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