Bump dropshot from `ab0194f` to `115dd34` #1922

Job	Run time
test-wasm	2m 30s
check-style	22s
build-and-test (ubuntu-latest)	2m 37s
build-and-test (windows-latest)	5m 17s
build-and-test (macos-latest)	2m 52s
	13m 38s

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