Update GitHub Actions

Author: RLumSK

.github/workflows/GitHub_Actions_CI.yaml

@@ -21,9 +21,9 @@ jobs:
         config:
           - {os: macos-11,   r: 'release', rspm: "https://packagemanager.rstudio.com/all/latest"}
           - {os: macos-10.15,   r: 'oldrel', rspm:  "https://packagemanager.rstudio.com/all/latest"}
-          - {os: ubuntu-20.04,   r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest", http-user-agent: "R/4.2.0 (ubuntu-20.04) R (4.2.0 x86_64-pc-linux-gnu x86_64 linux-gnu) on GitHub Actions" }
+          - {os: ubuntu-20.04,   r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
           - {os: ubuntu-20.04,   r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
-          - {os: ubuntu-18.04,   r: 'oldrel',  rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
+          - {os: ubuntu-20.04,   r: 'oldrel',  rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
       RSPM: ${{ matrix.config.rspm }}