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

[pylint-backport]

Backport d2589f1 from #10716.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.96%. Comparing base (aeffe52) to head (1736fb9).
⚠️ Report is 1 commits behind head on maintenance/4.0.x.

Additional details and impacted files

@@                Coverage Diff                 @@
##           maintenance/4.0.x   #10717   +/-   ##
==================================================
  Coverage              95.96%   95.96%           
==================================================
  Files                    176      176           
  Lines                  19518    19518           
==================================================
  Hits                   18731    18731           
  Misses                   787      787           

Files with missing lines	Coverage Δ
pylint/checkers/strings.py	94.29% <100.00%> (ø)

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