Update rspm

The rspm (RStudio Package Manager, now Posit
Package Manager) is a CRAN mirror that offers
precompiled packages for Linux, much faster
to install than source packages from CRAN.

When we set rspm, we have to choose the
URL that corresponds to the operating system
version where R is running.

In this case, what matters to us is the
operating system version of the bioconductor
docker image, since this continuous integration
workflow runs R inside that docker image.

To figure out what's that version you can
start a container with the bioconductor docker
image on your computer and check the version there.

docker run --rm bioconductor/bioconductor_docker:RELEASE_3_19 lsb_release -a

You will find the jammy codename (Ubuntu 22.04)

.github/workflows/check-bioc.yml

@@ -59,7 +59,7 @@ jobs:
               r: '4.4',
               bioc: '3.19',
               cont: "bioconductor/bioconductor_docker:RELEASE_3_19",
-              rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"
+              rspm: "https://packagemanager.rstudio.com/cran/__linux__/jammy/latest"
             }
           #- { os: macOS-latest, r: '4.2', bioc: '3.16'}
           #- { os: windows-latest, r: '4.2', bioc: '3.16'}