refactor(ci/cd): extend to two parallel dependabot PRs

[mfranzke]

Proposed changes

We'd like to not just run one but two dependabot PRs in parallel (e.g. if one pipeline is running after the merge to main) and that for divide them into two groups.

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

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[github-actions]

🔭🐙🐈 Test this branch here: https://db-ux-design-system.github.io/core-web/review/refactor-extend-to-two-parallel-dependabot-prs

[Copilot]

Pull Request Overview

This PR refactors the CI/CD pipeline concurrency configuration to allow up to two Dependabot PRs to run in parallel instead of running them sequentially. The change modifies the concurrency grouping logic to create two separate groups for Dependabot PRs based on the PR number modulo 2.

Key changes:

• Updates concurrency grouping to allow 2 parallel Dependabot PR executions
• Uses PR number modulo 2 to distribute Dependabot PRs across two groups
• Updates inline documentation to reflect the new parallel execution limit

[mfranzke]

We sadly cannot use modulo or arithmetic in workflow expressions.