macOS CI: Fix brew installation (#4493)

It appears that we need to call brew upgrade.
ECP-WarpX · Dec 9, 2023 · 044ab29 · 044ab29
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commit 044ab29
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diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
@@ -23,6 +23,7 @@ jobs:
         set +e
         brew unlink gcc
         brew update
+        brew upgrade || true
         brew install --overwrite python
         brew install ccache
         brew install fftw