Add Trino 447 release notes

docs/src/main/sphinx/release.md

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 ```{toctree}
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+release/release-447
 release/release-446
 release/release-445
 release/release-444

docs/src/main/sphinx/release/release-447.md

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+# Release 447 (8 May 2024)
+
+## General
+
+* Add support for [](/sql/show-create-function). ({issue}`21809`)
+* Add support for the {func}`bitwise_xor_agg` aggregation function. ({issue}`21436`)
+* {{breaking}} Require JDK 22 to run Trino. ({issue}`20980`)
+* Improve performance of `ORDER BY` queries with `LIMIT` on large data sets. ({issue}`21761`)
+* Improve performance of queries containing the {func}`rank` or
+  {func}`row_number` window functions. ({issue}`21639`)
+* Improve performance of correlated queries with `EXISTS`. ({issue}`21422`)
+* Fix potential failure for expressions involving `try_cast(parse_json(...))`. ({issue}`21877`)
+
+## CLI
+
+* Fix incorrect error location markers for SQL routines causing CLI to print
+  exceptions. ({issue}`21357`)
+
+## Delta Lake connector
+
+* Add support for concurrent `DELETE` and `TRUNCATE` queries. ({issue}`18521`)
+* Fix under-accounting of memory usage when writing strings to Parquet files. ({issue}`21745`)
+
+## Hive connector
+
+* Add support for metastore caching on tables that have not been analyzed, which
+  can be enabled with the `hive.metastore-cache.cache-missing-stats` and
+  `hive.metastore-cache.cache-missing-partitions` configuration properties. ({issue}`21822`)
+* Fix under-accounting of memory usage when writing strings to Parquet files. ({issue}`21745`)
+* Fix failure when translating Hive views that contain `EXISTS` clauses. ({issue}`21829`)
+
+## Hudi connector
+
+* Fix under-accounting of memory usage when writing strings to Parquet files. ({issue}`21745`)
+
+## Iceberg connector
+
+* Fix under-accounting of memory usage when writing strings to Parquet files. ({issue}`21745`)
+
+## Phoenix connector
+
+* {{breaking}} Remove support for Phoenix versions 5.1.x and earlier. ({issue}`21569`)
+
+## Pinot connector
+
+* Add support for specifying an explicit broker URL with the `pinot.broker-url`
+  configuration property. ({issue}`17791`)
+
+## Redshift connector
+
+* {{breaking}} Remove deprecated legacy type mapping and the associated
+  `redshift.use-legacy-type-mapping` configuration property. ({issue}`21855`)