Bump XDR once more

[2opremio]

Bump XDR to 7015193879e9da7cb70d889a49eecf494fefe7e1

The integration tests won't work until soroban-rpc has been updated (the corresponding soroban-rpc PR is stellar/stellar-cli#884 ).

[tsachiherman]

currently fails due to

2023-08-30T15:12:51.3784642Z     sac_test.go:1072: 
2023-08-30T15:12:51.3785849Z         	Error Trace:	/home/runner/work/go/go/services/horizon/internal/integration/sac_test.go:1072
2023-08-30T15:12:51.3787270Z         	            				/home/runner/work/go/go/services/horizon/internal/integration/sac_test.go:50
2023-08-30T15:12:51.3787829Z         	Error:      	Received unexpected error:
2023-08-30T15:12:51.3797683Z         	            	horizon error: "Transaction Failed" (tx_failed, resource_limit_exceeded) - check horizon.Error.Problem for more information
2023-08-30T15:12:51.3798395Z         	Test:       	TestContractMintToAccount

I'm going to beef up logging around that one, but the core issue is likly to be solved in the rpc fee calculations.

[2opremio]

I'm going to beef up logging around that one, but the core issue is likly to be solved in the rpc fee calculations.

Yes, I am on it with @sisuresh on Slack.