Update schema pack to 2021.4

Update the script to point to 2021.4.

Tested: built for evb-ast2500, ran Redfish Service Validator:
                             BASE    2021.4
metadataNamespaces:          2330      2388
pass:                        3239      3249
passAction:                     8         8
passGet:                      120       121
passRedfishUri:               114       115
skipNoSchema:                   3         3
skipOptional:                2180      2184
unverifiedAdditional.complex:   2         0
warnDeprecated:               315       315
warningPresent:                12        11
Validation has:         succeeded succeeded

Saw new schemas:
curl -k https://$bmc/redfish/v1/JsonSchemas/Manager/Manager.json
...
    "title": "#Manager.v1_14_0.Manager"
}

Signed-off-by: Sui Chen <suichen@google.com>
Change-Id: I6560ec010362df28e264d80452059b534b3f89ba
diff --git a/scripts/update_schemas.py b/scripts/update_schemas.py
index f5f5e0e..509fb7d 100755
--- a/scripts/update_schemas.py
+++ b/scripts/update_schemas.py
@@ -9,7 +9,7 @@
 
 import xml.etree.ElementTree as ET
 
-VERSION = "DSP8010_2021.3"
+VERSION = "DSP8010_2021.4"
 
 # To use a new schema, add to list and rerun tool
 include_list = [