Address new ruff errors

* Use .items() when extracting a value from a dictionary
* Suppress two instances where we don't use a context-manager when
  opening a temporary file as it wouldn't really help.

client/securedrop_client/crypto.py

@@ -100,7 +100,7 @@ def decrypt_submission_or_reply(
         """
         original_filename = Path(Path(filepath).stem).stem  # Remove one or two suffixes
 
-        err = tempfile.NamedTemporaryFile(suffix=".message-error", delete=False)
+        err = tempfile.NamedTemporaryFile(suffix=".message-error", delete=False)  # noqa: SIM115
         with tempfile.NamedTemporaryFile(suffix=".message") as out:
             cmd = self._gpg_cmd_base()
             cmd.extend(["--decrypt", filepath])

client/securedrop_client/gui/widgets.py

@@ -1237,9 +1237,9 @@ def update_sources(self, sources: list[Source]) -> list[str]:
             source_widget.reload()
 
         # Add widgets for new sources
-        for uuid in sources_to_add:
+        for uuid, source in sources_to_add.items():
             source_widget = SourceWidget(
-                self.controller, sources_to_add[uuid], self.source_selected, self.adjust_preview
+                self.controller, source, self.source_selected, self.adjust_preview
             )
             source_item = SourceListWidgetItem(self)
             source_item.setSizeHint(source_widget.sizeHint())

client/securedrop_client/sdk/__init__.py

@@ -133,7 +133,7 @@ def _rpc_target(self) -> list:
     def _streaming_download(
         self, data: dict[str, Any], env: dict
     ) -> StreamedResponse | JSONResponse:
-        fobj = tempfile.TemporaryFile("w+b")
+        fobj = tempfile.TemporaryFile("w+b")  # noqa: SIM115
 
         retry = 0
         bytes_written = 0