Merge upstream release-v4.4 into patched/release-v4.4

scripts/upgradeable/patch/06-add-immutable-self.patch

-diff --git a/contracts/proxy/utils/UUPSUpgradeable.sol b/contracts/proxy/utils/UUPSUpgradeable.sol
-index a9568729..860e66d7 100644
---- a/contracts/proxy/utils/UUPSUpgradeable.sol
-+++ b/contracts/proxy/utils/UUPSUpgradeable.sol
-@@ -24,10 +24,9 @@ abstract contract UUPSUpgradeable is Initializable, ERC1967UpgradeUpgradeable {
-     }
- 
-     function __UUPSUpgradeable_init_unchained() internal initializer {
--        __self = address(this);
-     }
-     /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
--    address private __self;
-+    address private immutable __self = address(this);
- 
-     /**
-      * @dev Check that the execution is being performed through a delegatecall call and that the execution context is