fix[stdlib]: fix IERC4626 signatures (#4425)

the signatures should not have default parameters; if used, they will
create a different method id at the callsite than the ERC4626 standard
actually accepts.

- add `stdlib` to the list of valid PR scopes

.github/workflows/pull-request.yaml

@@ -32,6 +32,7 @@ jobs:
           # docs: documentation
           # test: test suite
           # lang: language changes
+          # stdlib: changes to the stdlib
           # ux: language changes (UX)
           # tool: integration
           # ir: (old) IR/codegen changes
@@ -43,6 +44,7 @@ jobs:
             docs
             test
             lang
+            stdlib
             ux
             tool
             ir

vyper/builtins/interfaces/IERC4626.vyi

@@ -44,7 +44,7 @@ def previewDeposit(assets: uint256) -> uint256:
     ...
 
 @external
-def deposit(assets: uint256, receiver: address=msg.sender) -> uint256:
+def deposit(assets: uint256, receiver: address) -> uint256:
     ...
 
 @view
@@ -58,7 +58,7 @@ def previewMint(shares: uint256) -> uint256:
     ...
 
 @external
-def mint(shares: uint256, receiver: address=msg.sender) -> uint256:
+def mint(shares: uint256, receiver: address) -> uint256:
     ...
 
 @view
@@ -72,7 +72,7 @@ def previewWithdraw(assets: uint256) -> uint256:
     ...
 
 @external
-def withdraw(assets: uint256, receiver: address=msg.sender, owner: address=msg.sender) -> uint256:
+def withdraw(assets: uint256, receiver: address, owner: address) -> uint256:
     ...
 
 @view
@@ -86,5 +86,5 @@ def previewRedeem(shares: uint256) -> uint256:
     ...
 
 @external
-def redeem(shares: uint256, receiver: address=msg.sender, owner: address=msg.sender) -> uint256:
+def redeem(shares: uint256, receiver: address, owner: address) -> uint256:
     ...