feat: bump up jdtls to 1.31.0 #10

Job	Run time
Check package diffs	4s
Validate package definitions	12s
Test packages (darwin_arm64)	2m 56s
Test packages (darwin_x64)	1m 11s
Test packages (linux_arm)	26s
Test packages (linux_arm64)	30s
Test packages (linux_arm64_gnu)	40s
Test packages (linux_arm_gnu)	43s
Test packages (linux_x64)	26s
Test packages (linux_x64_gnu)	41s
Test packages (linux_x86)	41s
Test packages (win_arm)	1m 51s
Test packages (win_arm64)	1m 59s
Test packages (win_x64)	2m 3s
Test packages (win_x86)	1m 29s
Status check	0s
	15m 52s

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