bump @sigstore/sign from 2.3.2 to 3.0.0

Signed-off-by: Brian DeHamer <bdehamer@github.com>

src/sign.ts

@@ -86,7 +86,6 @@ const initBundleBuilder = (opts: SignOptions): BundleBuilder => {
     witnesses.push(
       new RekorWitness({
         rekorBaseURL: opts.rekorURL,
-        entryType: 'dsse',
         fetchOnConflict: true,
         timeout,
         retry
@@ -106,5 +105,5 @@ const initBundleBuilder = (opts: SignOptions): BundleBuilder => {
 
   // Build the bundle with the singleCertificate option which will
   // trigger the creation of v0.3 DSSE bundles
-  return new DSSEBundleBuilder({signer, witnesses, singleCertificate: true})
+  return new DSSEBundleBuilder({signer, witnesses})
 }