Upgrade to Rust v1.49.0

sdk/program/src/program_option.rs

@@ -950,6 +950,17 @@ impl<T> From<Option<T>> for COption<T> {
     }
 }
 
+#[rustversion::since(1.49.0)]
+impl<T> From<COption<T>> for Option<T> {
+    fn from(coption: COption<T>) -> Self {
+        match coption {
+            COption::Some(value) => Some(value),
+            COption::None => None,
+        }
+    }
+}
+
+#[rustversion::before(1.49.0)] // Remove `Into` once the BPF toolchain upgrades to 1.49.0 or newer
 impl<T> Into<Option<T>> for COption<T> {
     fn into(self) -> Option<T> {
         match self {

sdk/program/src/program_pack.rs

@@ -43,7 +43,7 @@ pub trait Pack: Sealed {
         if input.len() != Self::LEN {
             return Err(ProgramError::InvalidAccountData);
         }
-        Ok(Self::unpack_from_slice(input)?)
+        Self::unpack_from_slice(input)
     }
 
     /// Pack into slice