loongson/pypi: links for slack-signature-verifier

loongson/mirror slack_signature_verifier-0.7.tar.gz
loongson/mirror slack_signature_verifier-0.4.1.tar.gz
loongson/mirror slack_signature_verifier-0.4.tar.gz
loongson/mirror slack_signature_verifier-0.3.tar.gz
loongson/mirror slack_signature_verifier-0.2.tar.gz
loongson/mirror slack_signature_verifier-0.1.3.tar.gz
loongson/mirror slack_signature_verifier-0.1.2.tar.gz
loongson/mirror slack_signature_verifier-0.1.1.tar.gz
loongson/mirror slack_signature_verifier-0.1.tar.gz