Update font-stylesheet-gathering-plugin to be webpack 5 compatible

[timneutkens]

Solves the following warning:

(node:1484) [DEP_WEBPACK_MAIN_TEMPLATE_REQUIRE_FN] DeprecationWarning: MainTemplate.requireFn is deprecated (use "webpack_require")

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
buildDuration	8.6s	8.9s	⚠️ +292ms
nodeModulesSize	82.4 MB	82.4 MB	⚠️ +96 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.038	2.064	⚠️ +0.03
/ avg req/sec	1226.68	1211.44	⚠️ -15.24
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.086	1.103	⚠️ +0.02
/error-in-render avg req/sec	2302.88	2267.25	⚠️ -35.63

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
677f882d2ed8..0679.js gzip	12.8 kB	12.8 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-008bb91..b823.js gzip	6.56 kB	6.56 kB	✓
webpack-95c2..e870.js gzip	751 B	751 B	✓
Overall change	59.1 kB	59.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
polyfills-d3..23f6.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
_app-0d19cb6..5497.js gzip	1.28 kB	1.28 kB	✓
_error-2cf0e..a0a0.js gzip	3.69 kB	3.69 kB	✓
hooks-42456f..0c06.js gzip	887 B	887 B	✓
index-8081ce..e44f.js gzip	227 B	227 B	✓
link-0ab9f83..fa00.js gzip	1.61 kB	1.61 kB	✓
routerDirect..c3d8.js gzip	303 B	303 B	✓
withRouter-0..a68e.js gzip	302 B	302 B	✓
Overall change	8.31 kB	8.31 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
_buildManifest.js gzip	323 B	323 B	✓
Overall change	323 B	323 B	✓

Rendered Page Sizes

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
index.html gzip	615 B	615 B	✓
link.html gzip	621 B	621 B	✓
withRouter.html gzip	609 B	609 B	✓
Overall change	1.84 kB	1.84 kB	✓

---

Serverless Mode

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
buildDuration	10.3s	10.2s	-54ms
nodeModulesSize	82.4 MB	82.4 MB	⚠️ +96 B

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
677f882d2ed8..0679.js gzip	12.8 kB	12.8 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-008bb91..b823.js gzip	6.56 kB	6.56 kB	✓
webpack-95c2..e870.js gzip	751 B	751 B	✓
Overall change	59.1 kB	59.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
polyfills-d3..23f6.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
_app-0d19cb6..5497.js gzip	1.28 kB	1.28 kB	✓
_error-2cf0e..a0a0.js gzip	3.69 kB	3.69 kB	✓
hooks-42456f..0c06.js gzip	887 B	887 B	✓
index-8081ce..e44f.js gzip	227 B	227 B	✓
link-0ab9f83..fa00.js gzip	1.61 kB	1.61 kB	✓
routerDirect..c3d8.js gzip	303 B	303 B	✓
withRouter-0..a68e.js gzip	302 B	302 B	✓
Overall change	8.31 kB	8.31 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
_buildManifest.js gzip	323 B	323 B	✓
Overall change	323 B	323 B	✓

Serverless bundles

	vercel/next.js canary	timneutkens/next.js fix/webpack5-deprecation-warning-font-plugin	Change
_error.js	1 MB	1 MB	✓
404.html	2.67 kB	2.67 kB	✓
hooks.html	1.92 kB	1.92 kB	✓
index.js	1 MB	1 MB	✓
link.js	1.06 MB	1.06 MB	✓
routerDirect.js	1.05 MB	1.05 MB	✓
withRouter.js	1.05 MB	1.05 MB	✓
Overall change	5.16 MB	5.16 MB	✓

Commit: 2e7a141