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ARROW-16347: [Release] Escape backtick in verification script

Closes #13044 from kszucs/escape-backtick-verification

Lead-authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Co-authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>