Fix typos in Static Linux SDK Signature URLs (#937)

Author: kkebo

_data/builds/swift-6_1-branch/static_sdk.yml

@@ -1,17 +1,17 @@
 - date: 2025-03-25 10:10:00-06:00
   dir: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-25-a
   download: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-25-a_static-linux-0.0.1.artifactbundle.tar.gz
-  download_signature: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-25-a-a_static-linux-0.0.1.artifactbundle.tar.gz.sig
+  download_signature: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-25-a_static-linux-0.0.1.artifactbundle.tar.gz.sig
   checksum: 2b73c30ec402f443857e6cd2ac06b8525f186e889a7a727af05601629148fe6a
 - date: 2025-03-20 10:10:00-06:00
   dir: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-20-a
   download: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-20-a_static-linux-0.0.1.artifactbundle.tar.gz
-  download_signature: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-20-a-a_static-linux-0.0.1.artifactbundle.tar.gz.sig
+  download_signature: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-20-a_static-linux-0.0.1.artifactbundle.tar.gz.sig
   checksum: 66a67cd8dc4c01a79c9d2b5965c005f61aa4727c2e4e6170f678bfc0963b228a
 - date: 2025-03-12 10:10:00-06:00
   dir: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-12-a
   download: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-12-a_static-linux-0.0.1.artifactbundle.tar.gz
-  download_signature: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-12-a-a_static-linux-0.0.1.artifactbundle.tar.gz.sig
+  download_signature: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-03-12-a_static-linux-0.0.1.artifactbundle.tar.gz.sig
   checksum: c701d3f5bb69464fd443f20c4748cab068c9c6d8f6995f1ba5be70022778d21f
 - date: 2025-01-31 10:10:00-06:00
   dir: swift-6.1-DEVELOPMENT-SNAPSHOT-2025-01-31-a