fix(e2e): use portable sed flag for cross-platform packaging

sed -r is GNU-specific and fails on macOS (BSD sed) and Windows
(Git Bash). sed -E is the POSIX-portable equivalent supported
on all three platforms.

Author: oetr

end-to-end/package-jazzer-js.sh

@@ -7,7 +7,7 @@ npm run build --workspace='@jazzer.js/fuzzer'
 
 sed_version_and_mv() {
     while read data; do
-        local no_version=$(echo $data | sed -r -f end-to-end/remove-version.sed)
+        local no_version=$(echo $data | sed -E -f end-to-end/remove-version.sed)
         echo "mv $data end-to-end/$no_version"
         mv $data end-to-end/$no_version
     done