[Backport maintenance/4.0.x] Fix false positive for f-string-without-interpolation with template strings when using format spec (#10717)

Fix false positive for `f-string-without-interpolation` with template strings when using format spec (#10716)

(cherry picked from commit d2589f1)

Co-authored-by: Zen Lee <53538590+zenlyj@users.noreply.github.com>

Author: pylint-backport[bot]

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_py314.py

@@ -0,0 +1,4 @@
+# pylint: disable=missing-module-docstring
+
+PI = 3.14
+print(t"{PI:.1f}")

tests/functional/f/f_string_without_interpolation_py314.rc

@@ -0,0 +1,2 @@
+[testoptions]
+min_pyver=3.14