Upgrade to Rust v1.49.0 (bp #14810) (#14811)

* Upgrade to Rust v1.49.0

(cherry picked from commit cbffab7850)

# Conflicts:
#	core/src/crds_value.rs

* rebase

Co-authored-by: Michael Vines <mvines@gmail.com>

sdk/src/signature.rs

@@ -125,9 +125,9 @@ impl fmt::Display for Signature {
     }
 }
 
-impl Into<[u8; 64]> for Signature {
-    fn into(self) -> [u8; 64] {
-        <GenericArray<u8, U64> as Into<[u8; 64]>>::into(self.0)
+impl From<Signature> for [u8; 64] {
+    fn from(signature: Signature) -> Self {
+        signature.0.into()
     }
 }