Bump sigstore from 3.6.4 to 3.6.7

Author: ezio-melotti

requirements.txt

@@ -919,8 +919,8 @@ rich==13.9.4 \
 securesystemslib==1.2.0 \
     --hash=sha256:fa63abcb1cf4dba4f2df964f623baa45bc39029980d7a0a2119d90731942afc6
     # via tuf
-sigstore==3.6.4 \
-    --hash=sha256:d5678a7f4b78b084eb2c1a9eab31af81e6daf1f949abc3b7539a96900220d0d6
+sigstore==3.6.7 \
+    --hash=sha256:85d7512499eded0ffc310462d8be81731a631320751e390d74370d6458864df9
     # via -r requirements.in
 sigstore-protobuf-specs==0.3.2 \
     --hash=sha256:50c99fa6747a3a9c5c562a43602cf76df0b199af28f0e9d4319b6775630425ea