build(go): switch to go 1.21 (#2049)

Also update to the latest swaggo version, as the previous one did not work with go 1.21

Signed-off-by: Andrei Aaron <aaaron@luxoft.com>

scripts/update_licenses.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -x
+
+export GOFLAGS="-tags=debug,imagetrust,lint,metrics,mgmt,profile,scrub,search,sync,ui,userprefs,containers_image_openpgp"
+echo "Module | License URL | License" > THIRD-PARTY-LICENSES.md
+echo "---|---|---" >> THIRD-PARTY-LICENSES.md;
+
+for i in $(go list -m all  | awk '{print $1}'); do
+    l=$(go-licenses csv $i 2>/dev/null)
+    if [ $? -ne 0 ]; then continue; fi
+    echo $l | tr \, \| | tr ' ' '\n'
+done | LC_ALL=C sort -u >> THIRD-PARTY-LICENSES.md