Force use of @sap/cds-dk version 8.6.1 to avoid bug

Attempted workaround for a knownbug in some versions
of the CDS compiler (i.e. `@sap/cds-dk`).

Ref -> https://github.tools.sap/cap/issues/issues/17840

Author: data-douser

extractors/cds/tools/index-files.sh

@@ -36,12 +36,12 @@ then
     # directory.
     #
     # We also ensure we skip node_modules, as we can end up in a recursive loop
-    find . -type d -name node_modules -prune -false -o -type f \( -iname 'package.json' \) -exec grep -ql '@sap/cds' {} \; -execdir bash -c "grep -q \"^\$(pwd)\(/\|$\)\" \"$response_file\"" \; -execdir bash -c "echo \"Installing @sap/cds-dk into \$(pwd) to enable CDS compilation.\"" \; -execdir npm install --silent @sap/cds-dk \; -execdir npm install --silent \;
+    find . -type d -name node_modules -prune -false -o -type f \( -iname 'package.json' \) -exec grep -ql '@sap/cds' {} \; -execdir bash -c "grep -q \"^\$(pwd)\(/\|$\)\" \"$response_file\"" \; -execdir bash -c "echo \"Installing @sap/cds-dk into \$(pwd) to enable CDS compilation.\"" \; -execdir npm install --silent @sap/cds-dk@8.6.1 \; -execdir npm install --silent \;
 
     # Use the npx command to dynamically install the cds development kit (@sap/cds-dk) package if necessary,
     # which then provides the cds command line tool in directories which are not covered by the package.json
     # install command approach above
-    cds_command="npx -y --package @sap/cds-dk cds"
+    cds_command="npx -y --package @sap/cds-dk@8.6.1 cds"
 else
     cds_command="cds"
 fi
@@ -104,4 +104,4 @@ unset LGTM_INDEX_INCLUDE
 echo "Extracting the cds.json files"
 
 # Invoke the JavaScript autobuilder to index the .cds.json files only
-"$CODEQL_EXTRACTOR_JAVASCRIPT_ROOT"/tools/autobuild.sh
+"$CODEQL_EXTRACTOR_JAVASCRIPT_ROOT"/tools/autobuild.sh