CI (GHA, Buildbot): Update the list of commit statuses created by the "Create Buildbot Statuses" workflow (JuliaLang#42985)

Author: DilumAluthge

.github/workflows/statuses.yml

@@ -48,9 +48,6 @@ jobs:
       - run: |
           declare -a CONTEXT_LIST=(
                 "buildbot/tester_freebsd64"
-                "buildbot/tester_linux32"
-                "buildbot/tester_linux64"
-                # "buildbot/tester_linuxaarch64" # TODO: uncomment this line
                 "buildbot/tester_macos64"
                 "buildbot/tester_win32"
                 "buildbot/tester_win64"