[3.14] gh-136839: Refactor simple dict.update calls (GH-136811) (#136840)

gh-136839: Refactor simple dict.update calls (GH-136811)

Refactor simple dict.update calls

This commit refactors simple `dict.update({key: value})` calls which can
be done via `dict[key] = value` instead.

I found those cases with the [semgrep](https://semgrep.dev/) tool:

```
$ semgrep --lang python --pattern '$DICT.update({$A: ...})'

┌─────────────────┐
│ 5 Code Findings │
└─────────────────┘

    Lib/dataclasses.py
         1268┆ slots.update({slot: doc})

    Lib/multiprocessing/resource_tracker.py
           50┆ _CLEANUP_FUNCS.update({
           51┆     'semaphore': _multiprocessing.sem_unlink,
           52┆ })
            ⋮┆----------------------------------------
           53┆ _CLEANUP_FUNCS.update({
           54┆     'shared_memory': _posixshmem.shm_unlink,
           55┆ })

    Lib/tkinter/scrolledtext.py
           26┆ kw.update({'yscrollcommand': self.vbar.set})

    Lib/xmlrpc/server.py
          242┆ self.funcs.update({'system.multicall' : self.system_multicall})
```
(cherry picked from commit 69ea1b3a8f45fec46add3272ad47f14ff5321ae8)

Co-authored-by: Disconnect3d <dominik.b.czarnota@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/xmlrpc/server.py b/Lib/xmlrpc/server.py
index 8130c73..3e68711 100644
--- a/Lib/xmlrpc/server.py
+++ b/Lib/xmlrpc/server.py
@@ -239,7 +239,7 @@ class SimpleXMLRPCDispatcher:
 
         see http://www.xmlrpc.com/discuss/msgReader$1208"""
 
-        self.funcs.update({'system.multicall' : self.system_multicall})
+        self.funcs['system.multicall'] = self.system_multicall
 
     def _marshaled_dispatch(self, data, dispatch_method = None, path = None):
         """Dispatches an XML-RPC method from marshalled (XML) data.