Patch com.snowplowanalytics.monitoring.batch/alert/jsonschema/1-0-0

[chuwy]

Added in #1124.

Due a bug in schema-ddl, RDB Loader tries to create a table with duplicated tags column:

-- BEGINNING
    "severity"       VARCHAR(7)    ENCODE ZSTD NOT NULL,
    "tags"           VARCHAR(4096) ENCODE ZSTD NOT NULL,
    "base"           VARCHAR(1024) ENCODE ZSTD,
    "group"          VARCHAR(1024) ENCODE ZSTD,
    "tags"           VARCHAR(4096) ENCODE ZSTD,
-- THE REST

If I add properties: {} as recommended in original ticket - I get only one tags column, but it's nullable. Thus I think it's better to delete additionalProperties altogether.

It's safe to patch the schema because it was not used by any pipelines with Redshift - otherwise we'd know about loading failures.