Fix typo (#25841)

.github/workflows/report-size.yml

@@ -116,7 +116,7 @@ jobs:
 
           echo "FILESIZE=$FILESIZE_FORM" >> $GITHUB_OUTPUT
           echo "FILESIZE_GZIP=$FILESIZE_GZIP_FORM" >> $GITHUB_OUTPUT
-          echo "FILESIZE_BASE_=$FILESIZE_BASE_FORM" >> $GITHUB_OUTPUT
+          echo "FILESIZE_BASE=$FILESIZE_BASE_FORM" >> $GITHUB_OUTPUT
           echo "FILESIZE_BASE_GZIP=$FILESIZE_BASE_GZIP_FORM" >> $GITHUB_OUTPUT
           echo "FILESIZE_DIFF=$FILESIZE_DIFF" >> $GITHUB_OUTPUT
           echo "TREESHAKEN=$TREESHAKEN_FORM" >> $GITHUB_OUTPUT