bug#62092: 30.0.50; "case" does not work as dedenter in Python

[kobarity]

Hi,

New keywords "match" and "case" were added to block-start in
`python-rx', which enables basic indentation support for these
keywords.  However, "case" does not work as a dedenter.  For example,
try the following code.

#+begin_src python
match a:
    case 1:
        print(1)
        case 2:
#+end_src

At the "case 2:" line, inputting ":" does not dedent the line.
Several TAB keys are needed for correct indentation.

Attached is a patch to make "case" a dedenter with an ERT.

--
In GNU Emacs 30.0.50 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw scroll bars) of 2023-03-10 built on ubuntu
Repository revision: 8ee205d232574e12921b052c7e93b7e16d6f1187
Repository branch: master
System Description: Ubuntu 22.04.2 LTS

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0001-Make-case-keyword-a-dedenter-in-Python.patch
Description: Binary data