aggregator: Mark src_pad() return type as an AggregatorPad

I'm not sure if this is the right place to override this -- ideally we'd fix this in the C code, but it might be too late for that. Ditto trying to override in GIR potentially, and I couldn't find a way to do an override in our Gir.toml for the type, so coercion seems easiest.

mentioned in merge request gst-plugins-rs!1127 (merged)

assigned to @gstreamer-merge-bot

mentioned in commit arun/gstreamer-rs@273f084c

added 1 commit

• 273f084c - aggregator: Mark src_pad() return type as an AggregatorPad

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merged