eigen: bugfix in YAML variants file

Compiler/eigen/files/variants.yaml

@@ -3,7 +3,6 @@ eigen/3.3.9:
 - with: gcc/{7.5.0,8.4.0,9.3.0,10.3.0,11.2.0}
   rel_stage: unstable
   dependencies: b:cmake/3.15.5
-eigen/3.3.9:
 - with: gcc/{8.5.0,9.5.0,11.3.0,12.1.0}
   rel_stage: unstable
   dependencies: b:cmake/3.15.5
@@ -12,7 +11,6 @@ eigen/3.4.0:
 - with: gcc/{7.5.0,8.4.0,9.3.0,10.3.0,11.2.0}
   rel_stage: unstable
   dependencies: b:cmake/3.15.5
-eigen/3.4.0:
 - with: gcc/{8.5.0,9.5.0,11.3.0,12.1.0}
   rel_stage: unstable
   dependencies: b:cmake/3.15.5