Python 3.10 improvements (#1139)

## Description

Follow-up PR for #1133 but purely esthetic, no functional changes

Cleans up the code to make it more in comformance with Python 3.10
capabilities.

Replaces:
 - type `Union` with `|`
 - type `Dict`/`Set`/`List`/`Tuple` with `dict`/`set`/`list`/`tuple`
 - `Optional` with ` | None`
 - `if:` ... `elif`... -> `match`

Fixes: 
 - `gdb.events.*Event` -> `gdb.*Event`
- `GefHeapManager.malloc_align_address` had its `ceil` lambda moved as a
proper (nested) function

Lint:
 - `except:` -> `except Exception:`
 - removed a bunch of unused f-strings
 - `if not .. in ..` -> `if .. not in ..`
 - some short named variables renamed

.gitignore

@@ -14,3 +14,4 @@ debug.log
 htmlcov
 .benchmarks
 site/
+untracked/

ruff.toml

@@ -0,0 +1,2 @@
+[lint.per-file-ignores]
+"gef.py" = ["E701"]

tests/base.py

@@ -5,7 +5,7 @@ import re
 import subprocess
 import tempfile
 import time
-from typing import Tuple
+
 import unittest
 
 import rpyc
@@ -109,7 +109,9 @@ pi start_rpyc_service({self._port})
         return super().tearDown()
 
     @property
-    def gdb_version(self) -> Tuple[int, int]:
-        res = [int(d) for d in re.search(r"(\d+)\D(\d+)", self._gdb.VERSION).groups()]
-        assert len(res) >= 2
-        return tuple(res)
+    def gdb_version(self) -> tuple[int, int]:
+        res = re.search(r"(\d+)\D(\d+)", self._gdb.VERSION)
+        assert res
+        groups = [int(d) for d in res.groups()]
+        assert len(groups) == 2
+        return groups[0], groups[1]

tests/commands/gef_remote.py

@@ -71,5 +71,5 @@ class GefRemoteCommand(RemoteGefUnitTestGeneric):
         with gdbserver_session(port=port) as _:
             gdb.execute(f"target remote {GDBSERVER_DEFAULT_HOST}:{port}")
             res: str = root.eval("str(gef.session.remote)")
-            assert res.startswith(f"RemoteSession(target=':0', local='/tmp/")
+            assert res.startswith("RemoteSession(target=':0', local='/tmp/")
             assert res.endswith(f"pid={gef.session.pid}, mode={gdbserver_mode})")

tests/commands/theme.py

@@ -41,5 +41,5 @@ class ThemeCommand(RemoteGefUnitTestGeneric):
             gdb.execute(f"theme {t} {v}")
 
 
-        res = gdb.execute(f"theme ___I_DONT_EXIST___", to_string=True)
+        res = gdb.execute("theme ___I_DONT_EXIST___", to_string=True)
         self.assertIn("Invalid key", res)