fix: add a newline to separate "no issues found" from logs (#2665)

Resolves #2580

Author: G-Rath

cmd/osv-scanner/__snapshots__/main_test.snap

@@ -62,6 +62,7 @@ Scanning dir ./testdata/locks-one-with-nested
 Scanned <rootdir>/testdata/locks-one-with-nested/nested/composer.lock file and found 1 package
 Scanned <rootdir>/testdata/locks-one-with-nested/yarn.lock file and found 1 package
 Warning: plugin transitivedependency/pomxml can be risky when run on untrusted artifacts. Please ensure you trust the source code and artifacts before proceeding.
+
 No issues found
 
 ---
@@ -75,6 +76,7 @@ Warning: `scan` exists as both a subcommand of OSV-Scanner and as a file on the
 Scanning dir ./testdata/locks-many/composer.lock
 Scanned <rootdir>/testdata/locks-many/composer.lock file and found 1 package
 Warning: plugin transitivedependency/pomxml can be risky when run on untrusted artifacts. Please ensure you trust the source code and artifacts before proceeding.
+
 No issues found
 
 ---
@@ -87,6 +89,7 @@ No issues found
 Scanning dir ./testdata/locks-many/composer.lock
 Scanned <rootdir>/testdata/locks-many/composer.lock file and found 1 package
 Warning: plugin transitivedependency/pomxml can be risky when run on untrusted artifacts. Please ensure you trust the source code and artifacts before proceeding.
+
 No issues found
 
 ---

cmd/osv-scanner/scan/__snapshots__/command_test.snap

@@ -4,6 +4,7 @@ Scanning dir ./testdata/locks-one-with-nested
 Scanned <rootdir>/testdata/locks-one-with-nested/nested/composer.lock file and found 1 package
 Scanned <rootdir>/testdata/locks-one-with-nested/yarn.lock file and found 1 package
 Warning: plugin transitivedependency/pomxml can be risky when run on untrusted artifacts. Please ensure you trust the source code and artifacts before proceeding.
+
 No issues found
 
 ---
@@ -39,6 +40,7 @@ OPTIONS:
 Scanning dir ./testdata/locks-many/composer.lock
 Scanned <rootdir>/testdata/locks-many/composer.lock file and found 1 package
 Warning: plugin transitivedependency/pomxml can be risky when run on untrusted artifacts. Please ensure you trust the source code and artifacts before proceeding.
+
 No issues found
 
 ---
@@ -51,6 +53,7 @@ No issues found
 Scanning dir ./testdata/locks-many/composer.lock
 Scanned <rootdir>/testdata/locks-many/composer.lock file and found 1 package
 Warning: plugin transitivedependency/pomxml can be risky when run on untrusted artifacts. Please ensure you trust the source code and artifacts before proceeding.
+
 No issues found
 
 ---

cmd/osv-scanner/scan/image/__snapshots__/command_test.snap

@@ -102,6 +102,7 @@ Checking if docker image ("hello-world:linux") exists locally...
 Saving docker image ("hello-world:linux") to temporary file...
 Scanning image "hello-world:linux"
 No package sources found
+
 No issues found
 
 ---