Setting snapshot version after @johnduffell published https://github.com/guardian/play-googleauth/releases/tag/v8.0.1

This follows on from #233 -
it turns out the `message` val is now unused, so we can remove it, and simplify
the code a little!

PR #233 removed the exception message text from the error displayed to the end user,
because the error message text is unconstrained and this corresponds to
https://owasp.org/www-community/Improper_Error_Handling .

I was tempted to include the `desc` string in the error message displayed to the user,
as it is just the string "anti-forgery-token-invalid" or the exception class name, which
is more constrained, but re-reading the OWASP doc, this is also discouraged as it's
very similar to an error code. ("internal error messages such as stack traces, database
dumps, and error codes"). When getting error reports in the past, I've found it helpful if
they have received an error with a bit more context in it, as surprisingly the error reports
often don't include the user that saw the error, or when the error occurred, making it harder
to search logs for them! Still, I do appreciate the guidance from OWASP is right.

Remove unused `message` val

…workflow#23

Co-authored-by: gu-scala-steward-public-repos[bot] <108136057+gu-scala-steward-public-repos[bot]@users.noreply.github.com>

JamieB-gu published release version 8.0.2
using gha-scala-library-release-workflow: https://github.com/guardian/gha-scala-library-release-workflow

Release-Version: 8.0.2
Release-Initiated-By: https://github.com/JamieB-gu
Release-Workflow-Run: https://github.com/guardian/play-googleauth/actions/runs/9600561153
GitHub-Release-Notes: https://github.com/guardian/play-googleauth/releases/tag/v8.0.2