Bump @mui/material from 5.15.19 to 5.15.20 (#2910)

* Bump @mui/material from 5.15.19 to 5.15.20

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.15.19 to 5.15.20.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v5.15.20/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v5.15.20/packages/mui-material)

---
updated-dependencies:
- dependency-name: "@mui/material"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update snapshots

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Xavier FACQ <xavier.facq@free.fr>

package.json

@@ -12,7 +12,7 @@
     "@gatsbyjs/reach-router": "^2.0.1",
     "@mdx-js/react": "^2.3.0",
     "@mui/lab": "^5.0.0-alpha.97",
-    "@mui/material": "^5.15.19",
+    "@mui/material": "^5.15.20",
     "@mui/x-data-grid": "^7.7.0",
     "@mui/x-date-pickers": "^7.7.0",
     "@popperjs/core": "^2.11.8",

src/pages/__tests__/__snapshots__/docs.test.tsx.snap

@@ -20,7 +20,7 @@ exports[`Docs page > renders correctly 1`] = `
         class="main-search-box pt-3 d-block mx-auto"
       >
         <div
-          class="MuiAutocomplete-root MuiAutocomplete-hasPopupIcon css-1j0qgw8-MuiAutocomplete-root"
+          class="MuiAutocomplete-root MuiAutocomplete-hasPopupIcon css-ka7ti6-MuiAutocomplete-root"
           data-testid="autocomplete"
         >
           <div