bug(mat-dialog): Height issue in mat-dialog-actions with box-sizing: border-box

[PhilippeOberti]

Reproduction

Use StackBlitz to reproduce your issue: https://components-issue-yqtyor.stackblitz.io

Steps to reproduce:

1. Apply the following to your project:

* {
  box-sizing: border-box
}

Expected Behavior

The mat-dialog component shouldn't look different wether you use box-sizing: border-box or not.

Actual Behavior

The height of the mat-dialog-actions section looks different.

Environment

• Angular: 10.1.1
• CDK/Material: 10.2.1
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): macOS

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