.github/workflows: update actions

* bump actions
* fix indentation and other issues detected by yamllint

Signed-off-by: Anna (cybertailor) Vyalkova <cyber+gentoo@sysrq.in>

scripts/email-checker.py

@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
 
-from http.client import HTTPSConnection
-import json
 import sys
-from typing import Dict, Iterator, NamedTuple
-from urllib.parse import quote_plus
 import xml.etree.ElementTree as ET
 
+from http.client import HTTPSConnection
+from typing import Iterator, NamedTuple
+from urllib.parse import quote_plus
+
 
 class Maintainer(NamedTuple):
     name: str
@@ -18,7 +18,7 @@ class Maintainer(NamedTuple):
             resp = client.getresponse()
             resp.read()
             return resp.status == 200
-        except:
+        except Exception:
             return False