Fix false positive for f-string-without-interpolation

Author: zenlyj

doc/whatsnew/fragments/10702.false_positive

@@ -0,0 +1,4 @@
+Fix false positive for ``f-string-without-interpolation`` with template strings
+when using format spec.
+
+Closes #10702

pylint/checkers/strings.py

@@ -409,7 +409,7 @@ def visit_joinedstr(self, node: nodes.JoinedStr) -> None:
         self._check_interpolation(node)
 
     def _check_interpolation(self, node: nodes.JoinedStr) -> None:
-        if isinstance(node.parent, nodes.FormattedValue):
+        if isinstance(node.parent, (nodes.TemplateStr, nodes.FormattedValue)):
             return
         for value in node.values:
             if isinstance(value, nodes.FormattedValue):

tests/functional/f/f_string_without_interpolation.py

@@ -5,5 +5,6 @@
 
 print(f"some value {VALUE}")
 print(f'pi: {math.pi:.3f}')
+print(t"{math.pi:.1f}")
 
 print(f"ERROR")  # [f-string-without-interpolation]

tests/functional/f/f_string_without_interpolation.txt

@@ -1 +1 @@
-f-string-without-interpolation:9:6:9:14::Using an f-string that does not have any interpolated variables:UNDEFINED
+f-string-without-interpolation:10:6:10:14::Using an f-string that does not have any interpolated variables:UNDEFINED