* Upstream beta channel update: 91.0.4472.19
* debian/control: add a build dependency on libcurl4-openssl-dev
* debian/patches/build-with-old-libva-missing-defines.patch: refreshed
* debian/patches/build-with-old-libva-no-av1.patch: updated
* debian/patches/closure-compiler-use-system-wide-java.patch: added
* debian/patches/gn-no-last-commit-position.patch: refreshed
* debian/patches/node-use-system-wide.patch: refreshed
* debian/patches/set-rpath-on-chromium-executables.patch: refreshed
* debian/patches/suppress-newer-clang-warning-flags.patch: refreshed
* debian/patches/use-clang-versioned.patch: refreshed
* debian/patches/widevine-enable-version-string.patch: refreshed