Add v4.7.2 Release Notes

Author: andrewlecuyer

docs/content/releases/4.7.2.md

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+---
+title: "4.7.2"
+date:
+draft: false
+weight: 48
+---
+
+Crunchy Data announces the release of PGO, the Postgres Operator 4.7.2 on August 17, 2021.
+
+The PostgreSQL Operator is released in conjunction with the [Crunchy Container Suite](https://github.com/CrunchyData/crunchy-containers/).
+
+PostgreSQL Operator 4.7.2 release includes the following software versions upgrades:
+
+- [PostgreSQL](https://www.postgresql.org) is updated to 13.4, 12.8, 11.13, 10.18, and 9.6.23.
+- PL/Tcl is now included in the PostGIS (`crunchy-postgres-gis-ha`) container.
+
+## Changes
+
+- The `nss_wrapper` has been removed from the `crunchy-postgres-exporter` container.