gemini: avoid leaking database connections during the updates test (#5620)

Fixes https://github.com/TechEmpower/gemini/issues/85

frameworks/Java/gemini/src/main/webapp/WEB-INF/configuration/gemini-mysql.conf

@@ -96,8 +96,8 @@ db.LoginPass = benchmarkdbpass
 # db.Driver.MaxPooling
 #   How many concurrent Connections to allow at maximum.
 
-db.Driver.Pooling = 256
-db.Driver.MaxPooling = 256
+db.Driver.Pooling = 512
+db.Driver.MaxPooling = 512
 
 # BasicConnectionListener properties
 

frameworks/Java/gemini/src/main/webapp/WEB-INF/configuration/gemini-postgres.conf

@@ -96,8 +96,8 @@ db.LoginPass = benchmarkdbpass
 # db.Driver.MaxPooling
 #   How many concurrent Connections to allow at maximum.
 
-db.Driver.Pooling = 256
-db.Driver.MaxPooling = 256
+db.Driver.Pooling = 512
+db.Driver.MaxPooling = 512
 
 # BasicConnectionListener properties