Make Address:v6() constructor const

src/wire/ip.rs

@@ -104,7 +104,16 @@ impl Address {
     /// Create an address wrapping an IPv6 address with the given octets.
     #[cfg(feature = "proto-ipv6")]
     #[allow(clippy::too_many_arguments)]
-    pub fn v6(a0: u16, a1: u16, a2: u16, a3: u16, a4: u16, a5: u16, a6: u16, a7: u16) -> Address {
+    pub const fn v6(
+        a0: u16,
+        a1: u16,
+        a2: u16,
+        a3: u16,
+        a4: u16,
+        a5: u16,
+        a6: u16,
+        a7: u16,
+    ) -> Address {
         Address::Ipv6(Ipv6Address::new(a0, a1, a2, a3, a4, a5, a6, a7))
     }