parse legacy file should return highest patch version from go.mod match

Author: trevorackerman

.github/workflows/main.yml

@@ -29,7 +29,7 @@ jobs:
 
       - name: Test parsing 'go.mod'
         run: |
-          bin/parse-legacy-file test-fixtures/go.mod | grep "^1.19.3"
+          bin/parse-legacy-file test-fixtures/go.mod | grep "^1.18.6"
       - name: Test parsing '.go-version'
         run: |
           bin/parse-legacy-file test-fixtures/.go-version | grep "^1.17.13"