Fix flakey image-optimizer test

[ijjk]

x-ref: https://github.com/vercel/next.js/runs/5057168022?check_suite_focus=true
x-ref: https://github.com/vercel/next.js/runs/5055917244?check_suite_focus=true
x-ref: https://github.com/vercel/next.js/runs/5043791152?check_suite_focus=true

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall decrease ✓

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
buildDuration	13.1s	13.1s	-26ms
buildDurationCached	3.3s	3.3s	-22ms
nodeModulesSize	359 MB	359 MB	-7 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.073	3.007	-0.07
/ avg req/sec	813.42	831.41	+17.99
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.483	1.426	-0.06
/error-in-render avg req/sec	1685.35	1753.15	+67.8

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	27.3 kB	27.3 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.2 kB	71.2 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	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	2.37 kB	2.37 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	919 B	919 B	✓
image-HASH.js gzip	4.94 kB	4.94 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.19 kB	2.19 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	14.3 kB	14.3 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
index.html gzip	531 B	531 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Increase detected ⚠️)

General Overall decrease ✓

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
buildDuration	17s	17s	-54ms
buildDurationCached	3.3s	3.3s	-40ms
nodeModulesSize	359 MB	359 MB	-7 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.021	3.048	⚠️ +0.03
/ avg req/sec	827.64	820.27	⚠️ -7.37
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.47	1.452	-0.02
/error-in-render avg req/sec	1700.75	1721.54	+20.79

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	27.4 kB	27.4 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.3 kB	71.3 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	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	2.36 kB	2.36 kB	✓
head-HASH.js gzip	342 B	342 B	✓
hooks-HASH.js gzip	911 B	911 B	✓
image-HASH.js gzip	4.97 kB	4.97 kB	✓
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	2.21 kB	2.21 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	14.3 kB	14.3 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/image-optimizer-test	Change
index.html gzip	533 B	533 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.61 kB	1.61 kB	✓

Commit: 1f22707