Remove linuxbrew-core references

.github/ISSUE_TEMPLATE/config.yml

@@ -9,10 +9,7 @@ contact_links:
   about: Having a `brew` problem that's not from a `brew install` or `brew upgrade` of a single formula/package?
 - name: New issue on Homebrew/homebrew-core
   url: https://github.com/Homebrew/homebrew-core/issues/new/choose
-  about: On macOS/Mac OS X? Having a `brew` problem with a `brew install` or `brew upgrade` of a single formula/package? Report it to Homebrew/homebrew-core (the macOS core tap/repository).
+  about: Having a `brew` problem with a `brew install` or `brew upgrade` of a single formula/package? Report it to Homebrew/homebrew-core (the core tap/repository).
 - name: New issue on Homebrew/homebrew-cask
   url: https://github.com/Homebrew/homebrew-cask/issues/new/choose
   about: Having a `brew --cask` problem? Report it to Homebrew/homebrew-cask (the cask tap/repository).
-- name: New issue on Homebrew/linuxbrew-core
-  url: https://github.com/Homebrew/linuxbrew-core/issues/new/choose
-  about: On Linux? Having a `brew` problem with a `brew install` or `brew upgrade` of a single formula/package? Report it to Homebrew/linuxbrew-core (the Linux core tap/repository).

.github/workflows/tests.yml

@@ -89,12 +89,7 @@ jobs:
         # Use the default remotes but with Git Protocol
         run: |
           HOMEBREW_BREW_DEFAULT_GIT_REMOTE="https://github.com/Homebrew/brew"
-          if [[ "${{ runner.os }}" = "macOS" ]]
-          then
-            HOMEBREW_CORE_DEFAULT_GIT_REMOTE="https://github.com/Homebrew/homebrew-core"
-          else
-            HOMEBREW_CORE_DEFAULT_GIT_REMOTE="https://github.com/Homebrew/linuxbrew-core"
-          fi
+          HOMEBREW_CORE_DEFAULT_GIT_REMOTE="https://github.com/Homebrew/homebrew-core"
           export HOMEBREW_BREW_GIT_REMOTE="${HOMEBREW_BREW_DEFAULT_GIT_REMOTE/#https/git}"
           export HOMEBREW_CORE_GIT_REMOTE="${HOMEBREW_CORE_DEFAULT_GIT_REMOTE/#https/git}"
           /bin/bash -c "$(cat install.sh)"