ci: repair the clang-format check

Same failure mode as the gersemi check: Homebrew refuses to run formula install steps from an untrusted third party tap, so installing clang-format@19 aborts with 'unknown install step: run'.

Refresh the Homebrew metadata and trust the obsproject/tools tap before installing. The pinned clang-format 19.1.1 required by build-aux/run-clang-format is unchanged.

Signed-off-by: EdueskaWeiz <48769486+EdueskaWeiz@users.noreply.github.com>

Author: EdueskaWeiz

.github/actions/run-clang-format/action.yaml

@@ -36,6 +36,7 @@ runs:
         eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
         echo "/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin" >> $GITHUB_PATH
         echo "/home/linuxbrew/.linuxbrew/opt/clang-format@19/bin" >> $GITHUB_PATH
+        brew update
         brew install --quiet zsh
         echo ::endgroup::
 
@@ -51,6 +52,8 @@ runs:
         if (( ${+RUNNER_DEBUG} )) setopt XTRACE
 
         print ::group::Install clang-format-19
+        brew update
+        brew trust obsproject/tools
         brew install --quiet obsproject/tools/clang-format@19
         print ::endgroup::