Bump VERSION for 1.20.x #14153

Job	Run time
conditional-skip / Check whether to skip build and tests	29s
get-envoy-versions / Determine supported Envoy versions	6s
get-go-version / Determine Go toolchain version	5s
Setup	4s
Generate Envoy Job Matrices	4s
integration-test-with-deployer	1m 45s
dev-build / build	1m 5s
vault-integration-test (1.16.2)	2m 16s
nomad-integration-test (v1.7.7)	52s
vault-integration-test (1.15.6)	2m 10s
envoy-integration-test (server, case-centralconf\|case-ingress-gateway-multiple-services\|case-http...	6m 43s
nomad-integration-test (v1.6.10)	1m 1s
envoy-integration-test (server, case-cfg-resolver-svc-failover\|case-cfg-resolver-subset-redirect\|...	6m 12s
nomad-integration-test (v1.5.17)	2m 30s
vault-integration-test (1.14.10)	2m 6s
envoy-integration-test (server, case-api-gateway-tcp-tls-overlapping-hosts\|case-cross-peer-contro...	5m 51s
envoy-integration-test (server, case-api-gateway-http-hostnames)	2m 2s
envoy-integration-test (client, case-centralconf\|case-ingress-gateway-multiple-services\|case-http...	6m 50s
compatibility-integration-test	8m 17s
envoy-integration-test (client, case-cfg-resolver-svc-failover\|case-cfg-resolver-subset-redirect\|...	5m 59s
envoy-integration-test (client, case-api-gateway-tcp-tls-overlapping-hosts\|case-cross-peer-contro...	5m 38s
envoy-integration-test (client, case-api-gateway-http-hostnames)	2m 2s
test-integrations-success	1s
	1h 4m 8s

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