Google's android_hardware_broadcom_wlan repo is the most up-to-date place I could find. Not sure if there are others. For example BCM4330 latest version is 5.90.195.114 (2013) instead of 5.90.125.104 (2011) Similarly 4324, 4329, 4339, 4354, 4356-pcie and 4358-pcie should also get bumped.
4339 has seemingly been just updated to most recent version. 4354 went from 7.35.79.57 to 7.35.101.6.. But latest is actually 7.35.101.8 Same for 4356 (except it originally (except it was originally tagged with an nonsensical 7.35.180.119 2015 version) And not a lot of difference even with 4358, which again is 0.000.000.2 releases behind latest blob.