Bump trufflehog KGV (#551)

Some older versions _can_ vary between platforms (wasn't seeing this
locally, only in CI) in the issues they report for `--only-verified`
(particularly SSH keys). See
[here](https://github.com/trunk-io/plugins/actions/runs/6781616544/job/18432247238).
The latest versions appear to pretty stable when it comes to this. Bump
the KGV and remove old snapshots to get tests passing.

linters/trufflehog/plugin.yaml

@@ -15,13 +15,13 @@ tools:
     - name: trufflehog
       download: trufflehog
       shims: [trufflehog]
-      known_good_version: 3.31.3
+      known_good_version: 3.59.0
 lint:
   definitions:
     - name: trufflehog
       files: [ALL]
       tools: [trufflehog]
-      known_good_version: 3.31.3
+      known_good_version: 3.59.0
       known_bad_versions: [3.41.0, 3.45.0, 3.60.1, 3.60.2]
       commands:
         - name: lint
@@ -47,7 +47,7 @@ lint:
     - name: trufflehog-git
       files: [ALL]
       download: trufflehog
-      known_good_version: 3.40.0
+      known_good_version: 3.59.0
       known_bad_versions: [3.41.0, 3.60.1, 3.60.2]
       hold_the_line: false
       commands: