Update Mjolnir Anti Spam module to latest and add Renovate

roles/custom/matrix-synapse/defaults/main.yml

@@ -1331,7 +1331,8 @@ matrix_synapse_ext_spam_checker_synapse_simple_antispam_config_blocked_homeserve
 # See: https://github.com/matrix-org/mjolnir#synapse-module
 matrix_synapse_ext_spam_checker_mjolnir_antispam_enabled: false
 matrix_synapse_ext_spam_checker_mjolnir_antispam_git_repository_url: "https://github.com/matrix-org/mjolnir"
-matrix_synapse_ext_spam_checker_mjolnir_antispam_git_version: "v1.6.4"
+# renovate: datasource=docker depName=matrixdotorg/mjolnir
+matrix_synapse_ext_spam_checker_mjolnir_antispam_git_version: "v1.9.2"
 matrix_synapse_ext_spam_checker_mjolnir_antispam_config_block_invites: true
 # Flag messages sent by servers/users in the ban lists as spam. Currently
 # this means that spammy messages will appear as empty to users. Default