Update dependency image-size to v1.2.0 (#3384) #6780

Job	Run time
validate-docs-links	6s
build-native / build	1s
build-next / build	1s
rust check	0s
test cargo benchmarks	0s
types and precompiled	0s
lint	0s
test cargo integration	0s
test cargo unit	0s
test turbopack dev	0s
test experimental turbopack dev	0s
test experimental turbopack integration	0s
test next-swc wasm	0s
test turbopack integration	0s
test dev	0s
test firefox and safari	0s
test integration	0s
test prod	0s
report-test-results	0s
thank you, next	1s
	9s

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