chore(ci): Maximize CI/CD values (Dependabot & Permissions)

[hyperpolymath]

This automated PR updates your CI/CD configurations to maximize value and security.

• Dependabot: Ensures github-actions is monitored for updates.
• Security: Adds permissions: read-all to workflows missing explicit permissions.

[chatgpt-codex-connector]

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Reviewed commit: 93a4f54676

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[chatgpt-codex-connector]

Add the required SPDX header before changing this workflow

Checked .github/workflows/workflow-linter.yml: it runs on any change under .github/workflows/** (lines 6-12) and its first step fails if head -1 "$file" is not an SPDX header (lines 27-40). This patch modifies boj-build.yml, but the file still starts with name: instead of # SPDX-License-Identifier: ..., so any PR/push containing this commit will fail CI immediately in Check SPDX Headers.

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