toolkit linter line number off by one (#19782)

it is actually an intended feature by tslint:
https://github.com/palantir/tslint/issues/4528

So adding 1 to the line number here in the plugin

(cherry picked from commit 7562959e44)

packages/grafana-toolkit/src/cli/tasks/plugin.build.ts

@@ -152,9 +152,11 @@ export const lintPlugin = useSpinner<Fixable>('Linting', async ({ fix }) => {
     failures.forEach(f => {
       // tslint:disable-next-line
       console.log(
-        `${f.getRuleSeverity() === 'warning' ? 'WARNING' : 'ERROR'}: ${f.getFileName().split('src')[1]}[${
-          f.getStartPosition().getLineAndCharacter().line
-        }:${f.getStartPosition().getLineAndCharacter().character}]: ${f.getFailure()}`
+        `${f.getRuleSeverity() === 'warning' ? 'WARNING' : 'ERROR'}: ${
+          f.getFileName().split('src')[1]
+        }[${f.getStartPosition().getLineAndCharacter().line + 1}:${
+          f.getStartPosition().getLineAndCharacter().character
+        }]: ${f.getFailure()}`
       );
     });
     console.log('\n');