[readme] replace runkit CI badge with shields.io check-runs badge #34

Job	Run time
tests / matrix	12s
tests / vlt-matrix	14s
tests / bun-matrix	12s
tests / build	11s
tests / latest (bun i) (22.21)	1m 0s
tests / latest (bun i) (24.12)	59s
tests / latest (bun i) (25.2)	59s
tests / latest (bun i) (23.11)	1m 0s
tests / latest - 22.21	50s
tests / latest - 20.19	46s
tests / latest - 23.11	45s
tests / latest - 25.2	44s
tests / latest - 21.7	49s
tests / latest - 24.12	50s
tests / latest (vlt i) (22.21)	58s
tests / latest (vlt i) (24.12)	56s
tests / latest (vlt i) (25.2)	1m 1s
tests / latest (vlt i) (23.11)	1m 1s
tests / non-latest - ${{ matrix.node-version }}	0s
tests / node tests	9s
node >= 20	-1s
	13m 35s

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