rig rstudio fails if only minor version is in renv.lock

[kalenkovich]

I have only the minor (no patch) R version set up in a project. rig rstudio seems to stumble when reading the version from renv.lock:

$ rig rstudio project.Rproj
[ERROR] Invalid R version in renv.lock file: "4.3", unexpected end of input while parsing minor version number

Here is what the corresponding part of renv.lock looks like:

{
  "R": {
    "Version": "4.3",
    "Repositories": [
      {
        "Name": "CRAN",
        "URL": "https://packagemanager.posit.co/cran/latest"
      }
    ]
  },