gst-plugins-rs: sync recipe version with main branch version
Fixes:
WARNING: gst-plugins-rs version 0.13.0-alpha.1 doesn't match Cargo.toml version 0.14.0-alpha.1
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Fixes:
WARNING: gst-plugins-rs version 0.13.0-alpha.1 doesn't match Cargo.toml version 0.14.0-alpha.1