update(runner): remove executable permissions from dbsync_download/bi…

[ArturWieczorek]

Remove temporary chmod +x step after db-sync archive creation logic was fixed. This is a workaround until the tarball is packaged with correct permissions.

PR Link: IntersectMBO/cardano-db-sync#2100

Result:

artur@workstation:~/Projects/Archives/DB-Sync$ ll bin/13.7.0.4/
drwxr-xr-x artur artur 4.0 KB Tue Apr 28 21:10:57 2026  ./                           --
drwxr-xr-x artur artur 4.0 KB Wed Apr 29 15:01:55 2026  ../                          --
.r-xr-xr-x artur artur  91 MB Tue Apr 28 21:10:57 2026  cardano-db-sync*             --
.r-xr-xr-x artur artur  78 MB Tue Apr 28 21:10:57 2026  cardano-db-tool*             --
.r-xr-xr-x artur artur  41 MB Tue Apr 28 21:10:57 2026  cardano-smash-server*        --
.r-xr-xr-x artur artur  26 MB Tue Apr 28 21:10:57 2026  http-get-json-metadata*      --
.r-xr-xr-x artur artur  33 MB Tue Apr 28 21:10:57 2026  test-http-get-json-metadata* --