Update gitleaks toml to ignore lock files (nhs-england-tools#142)

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## Description
Updates `gitleaks.toml` to fix issue where lock files were not properly
allowed.

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scripts/config/gitleaks.toml

@@ -16,4 +16,4 @@ regexes = [
 ]
 
 [allowlist]
-files = ['.terraform.lock.hcl', 'poetry.lock', 'yarn.lock']
+paths = ['''.terraform.lock.hcl''', '''poetry.lock''', '''yarn.lock''']