Lock node version for CI

[ijjk]

Seems the default node version was recently changed in the GitHub actions image so this locks it to the previous version.

x-ref: actions/runner-images@d0f20dd
x-ref: https://github.com/vercel/next.js/runs/4394164018?check_suite_focus=true

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
buildDuration	18.4s	18.8s	⚠️ +329ms
buildDurationCached	3.4s	3.4s	⚠️ +17ms
nodeModulesSize	347 MB	347 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.969	3.034	⚠️ +0.06
/ avg req/sec	842.16	823.99	⚠️ -18.17
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.386	1.409	⚠️ +0.02
/error-in-render avg req/sec	1803.43	1774.61	⚠️ -28.82

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	28.4 kB	28.4 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	72.3 kB	72.3 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
_app-HASH.js gzip	1.37 kB	1.37 kB	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	326 B	326 B	✓
dynamic-HASH.js gzip	2.38 kB	2.38 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	635 B	635 B	✓
image-HASH.js gzip	4.49 kB	4.49 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	1.87 kB	1.87 kB	✓
routerDirect..HASH.js gzip	321 B	321 B	✓
script-HASH.js gzip	383 B	383 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	13.3 kB	13.3 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
index.html gzip	532 B	532 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
buildDuration	20.2s	19.7s	-466ms
buildDurationCached	3.3s	3.4s	⚠️ +14ms
nodeModulesSize	347 MB	347 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.958	2.965	⚠️ +0.01
/ avg req/sec	845.08	843.05	⚠️ -2.03
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.375	1.4	⚠️ +0.02
/error-in-render avg req/sec	1818.16	1785.66	⚠️ -32.5

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.6 kB	28.6 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	72.5 kB	72.5 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	180 B	180 B	✓
amp-HASH.js gzip	305 B	305 B	✓
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.37 kB	2.37 kB	✓
head-HASH.js gzip	342 B	342 B	✓
hooks-HASH.js gzip	622 B	622 B	✓
image-HASH.js gzip	4.53 kB	4.53 kB	✓
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	1.9 kB	1.9 kB	✓
routerDirect..HASH.js gzip	314 B	314 B	✓
script-HASH.js gzip	375 B	375 B	✓
withRouter-HASH.js gzip	309 B	309 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	13.3 kB	13.3 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js ci/lock-node-version	Change
index.html gzip	531 B	531 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	525 B	525 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: 395e649