Fix raw f-string FormatSpecs #557

Job	Run time
Linting	44s
Test Windows (2.7)	1m 25s
Test Windows (3.6)	1m 11s
Test Windows (3.7)	1m 28s
Test (python3.3)	23s
Test (python3.4)	25s
Test (python3.6)	24s
Test Windows (3.14)	1m 33s
Lint Dockerfiles (Dockerfile-fedora42)	13s
Test Windows (3.11)	47s
Test (python3.10)	41s
Test (python3.5)	25s
Test Windows (3.10)	55s
Lint Dockerfiles (Dockerfile-fedora28)	11s
Test (python2.7)	24s
Lint Dockerfiles (Dockerfile-fedora40)	13s
Lint Dockerfiles (Dockerfile-fedora38)	7s
Lint Dockerfiles (Dockerfile-fuzz)	10s
Lint Dockerfiles (Dockerfile-fedora34)	12s
Test (python3.9)	32s
Test (python3.7)	22s
Test Windows (3.9)	47s
Test Windows (3.12)	1m 30s
Test (python3.8)	22s
Test Windows (3.13)	49s
Lint Dockerfiles (Dockerfile-fedora32)	11s
Lint Dockerfiles (Dockerfile-fedora36)	25s
Test (python3.11)	33s
Test (python3.14)	45s
Lint Dockerfiles (Dockerfile-fedora30)	8s
Test (python3.13)	38s
Test (python3.12)	44s
Test (pypy3)	36s
Test (pypy)	34s
Test Windows (3.8)	1m 21s
	22m 8s

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