Upgrade Go in connectors

[lovromazgon]

We should upgrade Go to the latest version (currently 1.21), here's a full list of connectors in conduitio-labs and their Go version at the time of writing:

• [x] conduit-connector-databricks 1.21
• [x] conduit-connector-cassandra 1.21
• [x] conduit-connector-nats-jetstream 1.21
• [x] conduit-connector-oracle 1.21
• [x] conduit-connector-clickhouse 1.21
• [x] conduit-connector-mongo 1.21
• [x] conduit-connector-nats-pubsub 1.21
• [x] conduit-connector-cosmos-nosql 1.21
• [x] conduit-connector-snowflake 1.21
• [x] conduit-connector-gcp-pubsub 1.21
• [x] conduit-connector-weather 1.21
• [x] conduit-connector-vitess 1.21
• [x] conduit-connector-redis 1.21
• [x] conduit-connector-google-sheets 1.21
• [x] conduit-connector-notion 1.21
• [x] conduit-connector-sql-server 1.21
• [x] conduit-connector-neo4j 1.21
• [x] conduit-connector-sap-hana 1.21
• [x] conduit-connector-firebolt 1.21
• [x] conduit-connector-zendesk 1.21
• [x] conduit-connector-salesforce 1.21
• [x] conduit-connector-elasticsearch 1.21
• [x] conduit-connector-materialize 1.21
• [x] conduit-connector-db2 1.18
• [x] conduit-connector-chaos 1.21
• [x] conduit-connector-hubspot 1.21
• [x] conduit-connector-azure-storage 1.21
• [x] conduit-connector-stripe 1.21
• [x] conduit-connector-google-cloudstorage 1.21
• [x] conduit-connector-algolia 1.21
• [x] conduit-connector-bigquery 1.21
• [x] conduit-connector-http-server 1.21
• [x] conduit-connector-weaviate 1.21
• [x] conduit-connector-http 1.21

[lovromazgon]

@AdamHaffar since we have to touch the CI action files in this issue, I would like us to change the way we determine the Go version in all actions/setup-go actions - it should be determined based on the go.mod file (doc). Here's an example of how we changed it in the Kafka connector. This way it will become much simpler to update the Go version in the future.

It would be amazing if you could also make the same change in the connector template repo 🙏