chore: add explicit permissions to release-please workflow

[kinyoklion]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

Related issues

N/A — this is a permissions fix identified during an audit of all launchdarkly-sdk-tagged repositories.

Describe the solution you've provided

Adds explicit contents: write and pull-requests: write permissions to the release-please job in the release-please workflow. Without these, the release-please action may not have sufficient permissions to create release PRs or GitHub releases when the repository or org uses restrictive default token permissions.

Describe alternatives you've considered

Setting default permissions at the workflow level (permissions: at the top) was considered, but job-level permissions are more precise and avoid granting unnecessary access to other jobs in the same workflow.

Additional context

This was identified as part of an audit of all non-archived repos with the launchdarkly-sdk topic. The release-please job had no explicit permissions block, relying on default token permissions which may not include pull-requests: write.

Human review checklist:

• Confirm the permissions are applied to the correct job (release-please)
• Confirm no other jobs in the workflow are affected

Link to Devin session: https://app.devin.ai/sessions/a83b6e4f4fa14b96b859cfb50755a2c1
Requested by: @kinyoklion

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Note

Low Risk
Low risk: workflow-only change that grants release-please the minimal write permissions needed to open release PRs and create releases, without affecting application code.

Overview
Adds an explicit permissions block to the release-please GitHub Actions job, granting contents: write and pull-requests: write so the release-please action can create release PRs and publish releases under restrictive default token settings.

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