Update Iridium release date

Author: kirill-grouchnikov

versions.md

@@ -8,7 +8,7 @@
 * 4.0 - **Feldspar** (June 17, 2021), Java 9+. Details in the [announcement post](https://www.pushing-pixels.org/2021/06/17/radiance-4-0-0.html).
 * 4.5 - **Garnet** (October 3, 2021), Java 9+. Details in the [announcement post](https://www.pushing-pixels.org/2021/10/04/radiance-4-5-0-and-whats-next.html).
 * 5.0 - **Heliotrope** (October 25, 2021), Java 9+. Details in the [announcement post](https://www.pushing-pixels.org/2021/10/29/radiance-5-0-0.html).
-* 6.0 - **Iridium** (planned for H2 2022).
+* 6.0 - **Iridium** (September 1, 2022), Java 9+.
 
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 <img src="https://raw.githubusercontent.com/kirill-grouchnikov/radiance/sunshine/docs/images/icon/radiance_product_256.png" width="128" height="128" border=0>