Update tomasvotruba/unused-public requirement from 0.3.5 to 0.3.8 (#154)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

composer.json

@@ -24,7 +24,7 @@
         "thecodingmachine/phpstan-safe-rule": "^1.2",
         "tomasvotruba/cognitive-complexity": "0.2.2",
         "tomasvotruba/type-coverage": "0.2.4",
-        "tomasvotruba/unused-public": "0.3.5"
+        "tomasvotruba/unused-public": "0.3.8"
     },
     "config": {
         "optimize-autoloader": true,