Bump testcontainers.version from 1.20.4 to 1.20.6 #622

Author: garydgregory

RELEASE_NOTES.txt

@@ -1,4 +1,12 @@
-Release 5.5 ALPHA1
+Release 5.5 ALPHA2
+------------------
+
+Dependency updates:
+
+* Bump testcontainers.version from 1.20.4 to 1.20.6 #622.
+  Contributed by Gary Gregory <garydgregory at gmail.com>
+
+Release 5.5 ALPHA1
 ------------------
 
 This is the first ALPHA release in the 5.5 release series. It adds several experimental