Add support for more python operators (#33720)

Closes: https://github.com/zed-industries/zed/issues/33683

| Before | After |
| - | - |
| <img width="571" alt="Screenshot 2025-07-01 at 11 42 56"
src="https://github.com/user-attachments/assets/5ef79304-37bb-42a1-8891-d19a55a5095e"
/> | <img width="592" alt="Screenshot 2025-07-01 at 11 44 45"
src="https://github.com/user-attachments/assets/f28aa2a8-6306-4294-86e1-8f089f57b825"
/> |

Release Notes:

- python: Properly highlight additional operators ("&=", "<<=", ">>=",
"@=", "^=" and "|=")

crates/languages/src/python/highlights.scm

@@ -226,6 +226,12 @@
   ">>"
   "|"
   "~"
+  "&="
+  "<<="
+  ">>="
+  "@="
+  "^="
+  "|="
 ] @operator
 
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