Fix typos in Static Linux SDK Signature URLs

[kkebo]

Motivation:

As I commented here, a signature file of Static Linux SDK for Swift 6.1 has not available for download lately.

Download page: https://www.swift.org/install/macos/

The reason is that those URLs are wrong.

$ curl https://download.swift.org/swift-6.1-branch/static-sdk/swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-25-a/swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-25-a-a_static-linux-0.0.1.artifactbundle.tar.gz.sig
<?xml version="1.0" encoding="UTF-8" standalone="no"?><Error><Code>404</Code><Message>No message</Message><RequestId>d277fed7-878a-4468-8301-81b07128bbb5</RequestId></Error>
$ curl https://download.swift.org/swift-6.1-branch/static-sdk/swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-25-a/swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-25-a_static-linux-0.0.1.artifactbundle.tar.gz.sig
-----BEGIN PGP SIGNATURE-----
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=3LA5
-----END PGP SIGNATURE-----

Modifications:

I fixed typos in the Static Linux SDK Signature URLs.

Result:

At least the latest signature file is now available for download.