add committer fallback for fetch #6224

Job	Run time
pure-rust-build	2m 5s
cargo check MSRV (windows-2022)	3m 16s
Check MSRV badge	10s
cargo check MSRV (ubuntu-latest)	1m 42s
test	11m 32s
test-32bit (i386)	6m 8s
test-fixtures-windows	22m 26s
cargo-deny-advisories	30s
lint	3m 32s
cargo-deny	30s
check-blocking	5s
test-journey	4m 12s
check-packetline (ubuntu-latest)	5s
test-fast (ubuntu-latest)	2m 56s
test-32bit (arm32v7)	4m 24s
test-fast (ubuntu-24.04-arm)	2m 50s
test-32bit-windows-size-doc	7m 38s
test-fast (macos-latest)	2m 20s
test-fast (windows-latest)	14m 18s
WebAssembly (wasm32-wasip1)	40s
WebAssembly (wasm32-unknown-unknown)	1m 9s
Tests pass	3s
	1h 32m 31s

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