add committer fallback for fetch #6225

Job	Run time
Check MSRV badge	8s
test	11m 29s
pure-rust-build	1m 59s
cargo check MSRV (ubuntu-latest)	1m 35s
cargo check MSRV (windows-2022)	3m 22s
WebAssembly (wasm32-unknown-unknown)	58s
WebAssembly (wasm32-wasip1)	56s
test-32bit-windows-size-doc	7m 33s
test-fixtures-windows	19m 39s
cargo-deny	28s
check-blocking	6s
check-packetline (ubuntu-latest)	6s
test-journey	4m 4s
test-32bit (i386)	5m 44s
test-fast (ubuntu-24.04-arm)	2m 45s
test-32bit (arm32v7)	4m 59s
test-fast (macos-latest)	2m 45s
lint	3m 31s
test-fast (windows-latest)	13m 31s
test-fast (ubuntu-latest)	2m 58s
cargo-deny-advisories	27s
Tests pass	4s
	1h 29m 7s

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