minor: use arrow-rs casting from Float to Timestamp #24154

Job	Run time
Check cargo fmt	43s
cargo check	3m 15s
build with wasm-pack	2m 23s
cargo test (macos)	18m 11s
cargo test (macos-aarch64)	13m 14s
Verify MSRV (Min Supported Rust Version)	7m 2s
Verify Vendored Code	1m 2s
cargo test (win64)	40m 39s
clippy	5m 35s
cargo doc	3m 47s
cargo test datafusion-cli (amd64)	3m 45s
cargo test (amd64)	10m 29s
cargo test doc (amd64)	13m 2s
cargo examples (amd64)	10m 1s
Run sqllogictest with Postgres runner	3m 5s
cargo test pyarrow (amd64)	2m 25s
verify benchmark results (amd64)	10m 40s
check Cargo.toml formatting	2m 54s
check configs.md is up-to-date	2m 30s
cargo test hash collisions (amd64)	10m 24s
	2h 45m 6s

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