feat: group dependency updates

[43081j]

When listing dependency additions and removals, this will group them as
an "update" instead of having two separate entries. This means we can
better render the individual change in size.

Fixes #89.

[github-actions]

⚠️ Duplicate Dependencies (threshold: 1)

📦 Package	📋 Versions
eslint-visitor-keys	2 versions @e18e/action-dependency-diff@0.0.1 eslint@9.39.2 @eslint-community/eslint-utils@4.9.1 eslint-visitor-keys@3.4.3 @e18e/action-dependency-diff@0.0.1 eslint@9.39.2 @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@7.0.0 @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@7.0.0 ... @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@7.0.0 @octokit/plugin-paginate-rest@9.2.2 @octokit/types@12.6.0 @e18e/action-dependency-diff@0.0.1 @actions/github@7.0.0 ... @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@9.39.2 @eslint/eslintrc@3.3.1 ignore@5.3.2 @e18e/action-dependency-diff@0.0.1 typescript-eslint@8.52.0 @typescript-eslint/eslint-plugin@8.52.0 ignore@7.0.5
brace-expansion	2 versions @e18e/action-dependency-diff@0.0.1 eslint@9.39.2 @eslint/config-array@0.21.1 minimatch@3.1.2 brace-expansion@1.1.12 @e18e/action-dependency-diff@0.0.1 typescript-eslint@8.52.0 ... @typescript-eslint/typescript-estree@8.52.0 minimatch@9.0.5 brace-expansion@2.0.2
minimatch	2 versions @e18e/action-dependency-diff@0.0.1 eslint@9.39.2 @eslint/config-array@0.21.1 minimatch@3.1.2 @e18e/action-dependency-diff@0.0.1 typescript-eslint@8.52.0 @typescript-eslint/eslint-plugin@8.52.0 @typescript-eslint/type-utils@8.52.0 @typescript-eslint/typescript-estree@8.52.0 minimatch@9.0.5

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