Increase max heap size of Native Image builder to match Quarkus' CI #1947

Job	Run time
Nightly Quarkus and GraalVM build	28m 4s
Native Tests - Main	7m 7s
Native Tests - Data1	31m 12s
Native Tests - Data2	26m 58s
Native Tests - Data3	23m 38s
Native Tests - Data4	19m 5s
Native Tests - Data5	20m 18s
Native Tests - Data6	32m 21s
Native Tests - Data7	38m 18s
Native Tests - Amazon	18m 42s
Native Tests - Messaging1	34m 54s
Native Tests - Messaging2	15m 55s
Native Tests - Security1	24m 4s
Native Tests - Security2	28m 20s
Native Tests - Security3	15m 16s
Native Tests - Cache	18m 41s
Native Tests - HTTP	47m 50s
Native Tests - Misc1	33m 31s
Native Tests - Misc2	26m 25s
Native Tests - Misc3	30m 53s
Native Tests - Misc4	54m 35s
Native Tests - Spring	26m 37s
Native Tests - gRPC	24m 7s
Native Tests - Windows support	6s
Native Tests - DevTools Integration Tests	5m 11s
Native Tests - AWT, ImageIO and Java2D, Packaging .so files	14m 1s
	10h 46m 9s

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