[ci] fix LaTeX tools installation in R jobs (fixes #5802) (#5807)

.ci/test_r_package.sh

@@ -77,13 +77,14 @@ fi
 
 # Installing R precompiled for Mac OS 10.11 or higher
 if [[ $OS_NAME == "macos" ]]; then
+    brew update-reset && brew update
     if [[ $R_BUILD_TYPE == "cran" ]]; then
         brew install automake || exit -1
     fi
     brew install \
         checkbashisms \
         qpdf || exit -1
-    brew install --cask basictex || exit -1
+    brew install basictex || exit -1
     export PATH="/Library/TeX/texbin:$PATH"
     sudo tlmgr --verify-repo=none update --self || exit -1
     sudo tlmgr --verify-repo=none install inconsolata helvetic rsfs || exit -1

.github/workflows/r_package.yml

@@ -197,6 +197,9 @@ jobs:
         env:
           CTAN_MIRROR: https://ctan.math.illinois.edu/systems/win32/miktex
           TINYTEX_INSTALLER: TinyTeX
+          # pinning to an old version to address breaking changes to paths not being available yet
+          # (ref: https://github.com/r-lib/actions/issues/713#issuecomment-1481293175)
+          TINYTEX_VERSION: '2023.03'
       - name: Setup and run tests on Linux and macOS
         if: matrix.os == 'macOS-latest' || matrix.os == 'ubuntu-latest'
         shell: bash