Fix #1814 Trim EOL in setProperty from command output (#1815)

* Fix #1814 Trim EOL in setProperty from command output

* Fix(GitTagTaskTest): Wrong value in assertPropertyEquals

It was wrongly asserted that the outputProperty would contain
a newline character `\n`.
Ironically this test was written wrong to accomodate the bugged
capture of a newline at end of property value;
(which is the exact purpose of the fix in #1815)

src/Phing/Task/Ext/Git/GitDescribeTask.php

@@ -140,7 +140,7 @@ public function main()
         }
 
         if (null !== $this->outputProperty) {
-            $this->project->setProperty($this->outputProperty, $output);
+            $this->project->setProperty($this->outputProperty, trim($output));
         }
 
         $this->log(

src/Phing/Task/Ext/Git/GitTagTask.php

@@ -222,7 +222,7 @@ public function main()
         }
 
         if (null !== $this->outputProperty) {
-            $this->project->setProperty($this->outputProperty, $output);
+            $this->project->setProperty($this->outputProperty, trim($output));
         }
 
         $this->log(

tests/Phing/Test/Task/Ext/Git/GitTagTaskTest.php

@@ -137,7 +137,7 @@ public function testTagOutputPropertySet(): void
         $this->assertInLogs('git-tag command: LC_ALL=C && git tag \'marked\'');
         $this->assertInLogs('git-tag command: LC_ALL=C && git tag -l \'marked\'');
         $this->assertInLogs('git-tag output: marked');
-        $this->assertPropertyEquals('gitLogOutput', 'marked' . "\n");
+        $this->assertPropertyEquals('gitLogOutput', 'marked');
     }
 
     public function testTagWithCommitSet(): void