Fix `PooledBuffer` serialization #2292

Job	Run time
Azure Storage provider tests	0s
Consul provider tests (Consul)	5m 32s
Build (ubuntu-latest)	2m 15s
Azure Cosmos DB provider tests	0s
Build (windows-latest)	4m 39s
AWS DynamoDB provider tests (DynamoDB)	5m 34s
MariaDB/MySQL provider tests (MySql)	2m 36s
PostgreSQL provider tests (PostgreSql)	3m 20s
Microsoft SQL Server provider tests (SqlServer)	3m 17s
Redis provider tests (Redis)	4m 11s
ZooKeeper provider tests (ZooKeeper)	2m 31s
	33m 55s

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