Repository: material-ui
Issue: MuiButtonBase-root-MuiMenuItem-root ignores theme override MuiMenuItem (MUI V5.1.0)
Labels: bug 🐛,component: select

### Duplicates

- [X] I have searched the existing issues

### Latest version

- [X] I have tested the latest version

### Current behavior 😯

I wanted to change the height of my `MenuItems` globally through a theme override. However, there is another class still overriding the override.

<img width="375" alt="Screenshot 2021-11-16 at 16 12 41" src="https://user-images.githubusercontent.com/46386345/142014277-ffb38871-736a-4474-a213-6acc717d7447.png">

The green arrow is my setting min-height: 4.8rem. The red arrow is the overriding property (MuiButtonBase-root-MuiMenuItem-root min-height).

### Expected behavior 🤔

I expect my override (the green arrow) to be the top property, overriding the `MuiButtonBase-root-MuiMenuItem-root min-height: auto`

### Steps to reproduce 🕹

Using plain Select and MenuItem components.

My createTheme:

```
import { createTheme } from '@mui/material/styles';
import { theme } from './main-theme';

const muiTheme = createTheme({
    palette: {
        primary: {
            main: theme.colors.primary,
            dark: theme.colors.primary,
            light: theme.colors.primary,
        },
    },
    typography: {
        htmlFontSize: 10,
        fontSize: 14,
        fontFamily: ['"Open Sans"', '"sans-serif"'].join(','),
    },
    components: {
        MuiTableCell: {
            styleOverrides: {
                root: {
                    fontSize: '1.6rem',
                },
            },
        },
        MuiMenuItem: {
            styleOverrides: {
                root: {
                    minHeight: '4.8rem', 
                },
            },
        },
        MuiSelect: {
            styleOverrides: {
                root: {
                    fontSize: '1.6rem',
                    width: '100%',
                    backgroundColor: 'var(--color-gray-100)',
                },
                icon: {
                    color: 'var(--color-secondary)',
                },
            },
        },
    },
});

export { muiTheme };
```


### Context 🔦

_No response_

### Your environment 🌎

<details>
  <summary>`npx @mui/envinfo`</summary>

```
Browsers checked: Firefox developer and Safari

System:
    OS: macOS 11.6
  Binaries:
    Node: 14.17.5 - /usr/local/opt/node@14/bin/node
    Yarn: Not Found
    npm: 6.14.14 - /usr/local/opt/node@14/bin/npm
  Browsers:
    Chrome: Not Found
    Edge: Not Found
    Firefox: Not Found [... actually used 95.0b7 (64-bit) Developer Edition ...]
    Safari: 15.0 
  npmPackages:
    @emotion/react: ^11.5.0 => 11.5.0 
    @emotion/styled: ^11.3.0 => 11.3.0 
    @mui/core:  5.0.0-alpha.54 
    @mui/icons-material: ^5.1.0 => 5.1.0 
    @mui/material: ^5.1.0 => 5.1.0 
    @mui/private-theming:  5.1.0 
    @mui/styled-engine:  5.1.0 
    @mui/styled-engine-sc: ^5.1.0 => 5.1.0 
    @mui/styles: ^5.1.0 => 5.1.0 
    @mui/system:  5.1.0 
    @mui/types: ^7.1.0 => 7.1.0 
    @mui/utils:  5.1.0 
    @types/react: ^17.0.11 => 17.0.11 
    react: 17.0.2 => 17.0.2 
    react-dom: 17.0.2 => 17.0.2 
    styled-components: ^5.3.3 => 5.3.3 
    typescript: ~4.3.5 => 4.3.5 

```
</details>