Document dependency bumps

- Bump io.reactivex.rxjava3:rxjava from 3.1.9 to 3.1.10 #509
- Bump org.junit:junit-bom from 5.11.0 to 5.11.3 #501
- Bump testcontainers.version from 1.20.2 to 1.20.4 #505

Author: garydgregory

RELEASE_NOTES.txt

@@ -10,6 +10,15 @@ Change Log
 * Add ContentType.APPLICATION_ZIP_COMPRESSED.
   Contributed by Gary Gregory <ggregory at apache.org>
 
+* Bump io.reactivex.rxjava3:rxjava from 3.1.9 to 3.1.10 #509
+  Contributed by Gary Gregory <ggregory at apache.org>
+
+* Bump org.junit:junit-bom from 5.11.0 to 5.11.3 #501
+  Contributed by Gary Gregory <ggregory at apache.org>
+
+* Bump testcontainers.version from 1.20.2 to 1.20.4 #505
+  Contributed by Gary Gregory <ggregory at apache.org>
+
 
 Release 5.3
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