Fix fetching when no branch is specified #369

Job	Run time
flake	3m 10s
semver	4m 4s
lint	27s
test (ubuntu-latest)	22s
update-release-draft	0s
test (macos-latest)	28s
versions	1m 11s
test (windows-latest)	3m 39s
package (aarch64-unknown-linux-musl, ubuntu-latest, tar, true)	2m 31s
package (x86_64-unknown-linux-musl, ubuntu-latest, tar, true)	2m 38s
package (aarch64-apple-darwin, macos-14, gtar, false)	1m 59s
package (x86_64-apple-darwin, macos-12, gtar, false)	3m 6s
package (x86_64-pc-windows-msvc, windows-latest, tar, false, .exe)	2m 49s
release	0s
	26m 24s

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