ci: pin the actions/checkout version to avoid libgit2's incompatibility

rocker-org / rocker-versioned2

Run current & prior versions of R using docker. rocker/r-ver, rocker/rstudio, rocker/shiny, rocker/tidyverse, and so on.

https://rocker-project.org

GNU General Public License v2.0

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Closed eitsupi closed 2 months ago

eitsupi commented 2 months ago

See actions/checkout#1692