Exports using GitHub or GitLab configuration files fail on Windows

[rsenden]

Running FortifyVulnerabilityExporter on Windows results in an error if any of the following environment variables is set to an absolute path with drive letter:

• EXPORT_DIR (all configuration files that refer to export.dir)
• GITHUB_WORKSPACE (all GitHub-related configuration files)
• CI_PROJECT_DIR (all GitLab-related configuration files)

The error doesn't occur in the following cases:

• When using an absolute path without drive letter, i.e. \Temp\SomeDir
• If the output file already exists (the error does occur though if the output directory exists but the file does not exist)

Errors look something like the below:

    Failed to bind properties under 'json.gitlab.dast.output.file' to java.io.File:

    Property: json.gitlab.dast.output.file
    Value: ${export.dir}/gl-fortify-dast.json
    Origin: URL [file:config/FoDToGitLab.yml] - 35:11
    Reason: failed to convert java.lang.String to java.io.File

[rsenden]

Root cause is described here: spring-projects/spring-boot#25566