Increase max heap size of Native Image builder to match Quarkus' CI #1948

Job	Run time
Nightly Quarkus and GraalVM build	22m 25s
Native Tests - Main	13m 38s
Native Tests - Data1	33m 49s
Native Tests - Data2	29m 35s
Native Tests - Data3	24m 29s
Native Tests - Data4	18m 51s
Native Tests - Data5	20m 32s
Native Tests - Data6	32m 0s
Native Tests - Data7	36m 16s
Native Tests - Amazon	18m 8s
Native Tests - Messaging1	36m 48s
Native Tests - Messaging2	15m 20s
Native Tests - Security1	23m 7s
Native Tests - Security2	28m 36s
Native Tests - Security3	14m 9s
Native Tests - Cache	18m 6s
Native Tests - HTTP	50m 10s
Native Tests - Misc1	31m 25s
Native Tests - Misc2	23m 55s
Native Tests - Misc3	28m 57s
Native Tests - Misc4	53m 3s
Native Tests - Spring	21m 51s
Native Tests - gRPC	23m 46s
Native Tests - Windows support	7s
Native Tests - DevTools Integration Tests	4m 15s
Native Tests - AWT, ImageIO and Java2D, Packaging .so files	9m 38s
	10h 32m 56s

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