chore: forward port 3.6.5 (#1534)

This is just a version number change: All changes in 3.6.5 were
backported from main.

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>
Co-authored-by: William Woodruff <william@trailofbits.com>

Author: jku

sigstore/__init__.py

@@ -25,4 +25,4 @@
 * `sigstore.sign`: creation of Sigstore signatures
 """
 
-__version__ = "3.6.4"
+__version__ = "3.6.5"