Tell curl to use HTTP version 1.1

By default, was getting the following error:
curl: (92) HTTP/2 stream 0 was not closed cleanly: PROTOCOL_ERROR (err 1)

bin/build-helper

@@ -214,6 +214,7 @@ eof
 
         # upload archive
         response_archive=$(curl -f -X POST \
+             --http1.1 \
              -H "PRIVATE-TOKEN: ${token}" \
              -F "file=@${archivename}" \
              "https://code.ungleich.ch/api/v4/projects/${project}/uploads" \
@@ -221,6 +222,7 @@ eof
 
         # upload archive signature
         response_archive_sig=$(curl -f -X POST \
+             --http1.1 \
              -H "PRIVATE-TOKEN: ${token}" \
              -F "file=@${archivename}.asc" \
             "https://code.ungleich.ch/api/v4/projects/${project}/uploads" \

bin/build-helper.freebsd

@@ -249,6 +249,7 @@ eof
 
         # upload archive
         response_archive=$(curl -f -X POST \
+             --http1.1 \
              -H "PRIVATE-TOKEN: ${token}" \
              -F "file=@${archivename}" \
              "https://code.ungleich.ch/api/v4/projects/${project}/uploads" \
@@ -256,6 +257,7 @@ eof
 
         # upload archive signature
         response_archive_sig=$(curl -f -X POST \
+             --http1.1 \
              -H "PRIVATE-TOKEN: ${token}" \
              -F "file=@${archivename}.asc" \
             "https://code.ungleich.ch/api/v4/projects/${project}/uploads" \