Use "with suppress()" to suppress python exceptions

Using
```Python
with suppress(OSError):
    os.remove('somefile.tmp')
```
instead of
```Python
try:
    os.remove('somefile.tmp')
except OSError:
    pass
```
makes the code more compact and more readable IMO.

This pattern was recommended by Raymond Hettinger, a Python Core
Developer in his talk "Transforming Code into Beautiful, Idiomatic Python" at https://www.youtube.com/watch?v=OSGv2VnC0go. The transcript is available at https://github.com/JeffPaine/beautiful_idiomatic_python

kittens/unicode_input/main.py

@@ -7,6 +7,7 @@ import string
 import subprocess
 from functools import lru_cache
 from gettext import gettext as _
+from contextlib import suppress
 
 from kitty.config import cached_values_for
 from kitty.constants import config_dir
@@ -293,24 +294,20 @@ class UnicodeInput(Handler):
         self.update_codepoints()
         self.current_char = None
         if self.mode is HEX:
-            try:
+            with suppress(Exception):
                 if self.line_edit.current_input.startswith(INDEX_CHAR) and len(self.line_edit.current_input) > 1:
                     self.current_char = chr(self.table.codepoint_at_hint(self.line_edit.current_input[1:]))
                 else:
                     code = int(self.line_edit.current_input, 16)
                     self.current_char = chr(code)
-            except Exception:
-                pass
         elif self.mode is NAME:
             cc = self.table.current_codepoint
             if cc:
                 self.current_char = chr(cc)
         else:
-            try:
+            with suppress(Exception):
                 if self.line_edit.current_input:
                     self.current_char = chr(self.table.codepoint_at_hint(self.line_edit.current_input.lstrip(INDEX_CHAR)))
-            except Exception:
-                pass
         if self.current_char is not None:
             code = ord(self.current_char)
             if not codepoint_ok(code):
@@ -483,10 +480,8 @@ def main(args):
         handler = UnicodeInput(cached_values)
         loop.loop(handler)
         if handler.current_char and loop.return_code == 0:
-            try:
+            with suppress(Exception):
                 handler.recent.remove(ord(handler.current_char))
-            except Exception:
-                pass
             recent = [ord(handler.current_char)] + handler.recent
             cached_values['recent'] = recent[:len(DEFAULT_SET)]
             return handler.current_char