fix: do not catch bare exceptions

Bare excepts will catch keyboard-exit exceptions, system-exit etc. which
is probably not what we want.

dangerzone/isolation_provider/container.py

@@ -124,7 +124,7 @@ class Container(IsolationProvider):
                     [Container.get_runtime(), "rmi", "--force", found_image_id],
                     startupinfo=get_subprocess_startupinfo(),
                 )
-            except:
+            except Exception:
                 log.warning("Couldn't delete old container image, so leaving it there")
 
         return installed

dangerzone/settings.py

@@ -79,7 +79,7 @@ class Settings:
                         if version.parse(get_version()) > version.parse(self.get(key)):
                             self.set(key, get_version())
 
-            except:
+            except Exception:
                 log.error("Error loading settings, falling back to default")
                 self.settings = self.default_settings