fix: single line f-string format error in py3.12 (#2588)

### Description

fix #2586 for some cases do not considered in #2485

### QC
<!-- Make sure that you can tick the boxes below. -->

* [x] The PR contains a test case for the changes or the changes are
already covered by an existing test case.
* [ ] The documentation (`docs/`) is updated to reflect the changes or
this is not necessary (e.g. if the change does neither modify the
language nor the behavior or functionalities of Snakemake).

snakemake/parser.py

@@ -536,7 +536,7 @@ def __init__(self, snakefile, rulename, base_indent=0, dedent=0, root=True):
         super().__init__(
             snakefile, rulename, base_indent=base_indent, dedent=dedent, root=root
         )
-        self.cmd = list()
+        self.cmd: list[tuple[str, tokenize.TokenInfo]] = []
         self.token = None
         if self.overwrite_cmd is not None:
             self.block_content = self.overwrite_block_content
@@ -564,7 +564,7 @@ def end(self):
         yield INDENT * (self.effective_indent + 1)
         yield self.end_func
         yield "("
-        yield "\n".join(self.cmd)
+        yield from self.cmd
         yield from self.args()
         yield "\n"
         yield ")"
@@ -577,19 +577,18 @@ def decorate_end(self, token):
             self.error(
                 "Command must be given as string after the shell keyword.", token
             )
-        for t in self.end():
-            yield t, self.token
+        yield from super().decorate_end(self.token)
 
     def block_content(self, token):
         self.token = token
-        self.cmd.append(token.string)
+        self.cmd.append((token.string, token))
         yield token.string, token
 
     def overwrite_block_content(self, token):
         if self.token is None:
             self.token = token
             cmd = repr(self.overwrite_cmd)
-            self.cmd.append(cmd)
+            self.cmd.append((cmd, token))
             yield cmd, token
 
 

tests/test_fstring/Snakefile

@@ -10,6 +10,10 @@ rule unit1:
         "echo '>'{output}'<'; touch {output}; sleep 1"
 
 
+rule unit2:
+    shell:
+        f"ls"
+
 assert (
     f"""
 {