Bump webpack-dev-middleware in /datafusion/wasmtest/datafusion-wasm-app #316

Job	Run time
Check cargo fmt	56s
cargo check	7m 16s
build with wasm-pack	2m 12s
cargo test (mac)	6m 22s
Verify MSRV	7m 4s
Verify Vendored Code	57s
cargo test (win64)	9m 20s
cargo test (amd64)	3m 34s
cargo test datafusion-cli (amd64)	3m 34s
clippy	2m 28s
cargo test hash collisions (amd64)	6m 43s
cargo test doc (amd64)	10m 2s
cargo examples (amd64)	5m 1s
Run sqllogictest with Postgres runner	3m 24s
cargo test pyarrow (amd64)	2m 27s
verify benchmark results (amd64)	9m 5s
check Cargo.toml formatting	1m 42s
check configs.md is up-to-date	2m 33s
cargo doc	3m 53s
	1h 28m 33s

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