feat: support PR target setups

[43081j]

When using a PR target trigger, the context.sha is main, while the
pull_request.head.sha is the PR.

[github-actions]

⚠️ Duplicate Dependencies (threshold: 1)

📦 Package	📋 Versions
eslint-visitor-keys	2 versions @e18e/action-dependency-diff@0.0.1 eslint@9.39.1 @eslint-community/eslint-utils@4.9.0 eslint-visitor-keys@3.4.3 @e18e/action-dependency-diff@0.0.1 eslint@9.39.1 @eslint/eslintrc@3.3.1 espree@10.4.0 eslint-visitor-keys@4.2.1
@octokit/openapi-types	2 versions @e18e/action-dependency-diff@0.0.1 @actions/github@6.0.1 @octokit/plugin-paginate-rest@9.2.2 @octokit/types@12.6.0 @octokit/openapi-types@20.0.0 @e18e/action-dependency-diff@0.0.1 @actions/github@6.0.1 ... @octokit/endpoint@9.0.6 @octokit/types@13.10.0 @octokit/openapi-types@24.2.0
@octokit/types	2 versions @e18e/action-dependency-diff@0.0.1 @actions/github@6.0.1 @octokit/plugin-paginate-rest@9.2.2 @octokit/types@12.6.0 @e18e/action-dependency-diff@0.0.1 @actions/github@6.0.1 ... @octokit/request@8.4.1 @octokit/endpoint@9.0.6 @octokit/types@13.10.0
ignore	2 versions @e18e/action-dependency-diff@0.0.1 eslint@9.39.1 @eslint/eslintrc@3.3.1 ignore@5.3.2 @e18e/action-dependency-diff@0.0.1 typescript-eslint@8.47.0 @typescript-eslint/eslint-plugin@8.47.0 ignore@7.0.5
brace-expansion	2 versions @e18e/action-dependency-diff@0.0.1 eslint@9.39.1 @eslint/config-array@0.21.1 minimatch@3.1.2 brace-expansion@1.1.12 @e18e/action-dependency-diff@0.0.1 typescript-eslint@8.47.0 ... @typescript-eslint/typescript-estree@8.47.0 minimatch@9.0.5 brace-expansion@2.0.2
minimatch	2 versions @e18e/action-dependency-diff@0.0.1 eslint@9.39.1 @eslint/config-array@0.21.1 minimatch@3.1.2 @e18e/action-dependency-diff@0.0.1 typescript-eslint@8.47.0 @typescript-eslint/eslint-plugin@8.47.0 @typescript-eslint/type-utils@8.47.0 @typescript-eslint/typescript-estree@8.47.0 minimatch@9.0.5
glob-parent	2 versions @e18e/action-dependency-diff@0.0.1 typescript-eslint@8.47.0 ... @typescript-eslint/typescript-estree@8.47.0 fast-glob@3.3.3 glob-parent@5.1.2 @e18e/action-dependency-diff@0.0.1 eslint@9.39.1 glob-parent@6.0.2
picomatch	2 versions @e18e/action-dependency-diff@0.0.1 typescript-eslint@8.47.0 ... fast-glob@3.3.3 micromatch@4.0.8 picomatch@2.3.1 @e18e/action-dependency-diff@0.0.1 vitest@4.0.10 picomatch@4.0.3

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