fix(add-eso-version): fix separator line pattern for stability-support.md update (#6113)

Signed-off-by: Riccardo M. Cefala <riccardo@cefala.net>
Co-authored-by: Gergely Bräutigam <gergely.brautigam@sap.com>

hack/api-docs/add_eso_version.sh

@@ -66,7 +66,7 @@ BEGIN {
 }
 
 # Match the separator line (dashes) only in the ESO Version table
-in_eso_table == 1 && /\| -+/ {
+in_eso_table == 1 && /\|-+/ {
     print $0;
     print new_line;
     added_new_line = 1;