fix(ci): use public pdfium-binaries source (#14)

docusealco/pdfium-binaries is a private repo, inaccessible from
fork CI. Switch to bblanchon/pdfium-binaries which is the canonical
public source with identical archive structure.

Co-authored-by: Sebastian Noe <sebastian.schneider@boxine.de>

.github/workflows/ci.yml

@@ -163,7 +163,7 @@ jobs:
           yarn install
           sudo apt-get update
           sudo apt-get install -y libvips
-          wget -O pdfium-linux.tgz "https://github.com/docusealco/pdfium-binaries/releases/latest/download/pdfium-linux-$(uname -m | sed 's/x86_64/x64/;s/aarch64/arm64/').tgz"
+          wget -O pdfium-linux.tgz "https://github.com/bblanchon/pdfium-binaries/releases/latest/download/pdfium-linux-$(uname -m | sed 's/x86_64/x64/;s/aarch64/arm64/').tgz"
           sudo tar -xzf pdfium-linux.tgz --strip-components=1 -C /usr/lib lib/libpdfium.so
           rm -f pdfium-linux.tgz
       - name: Run