release 5.6.1 (#152)

Mark previously deprecated SSL settings as obsolete (#149)

* Mark previously deprecated SSL settings as obsolete

- SSL settings that were marked deprecated in version `5.6.0` are now marked obsolete, and will prevent the plugin from starting.
- These settings are:
  - `cacert`, which should be replaced by `ssl_certificate_authorities`
  - `client_cert`, which should be replaced by `ssl_certificate`
  - `client_key`, which should be replaced by `ssl_key`
  - `keystore`, which should be replaced by `ssl_keystore_path`
  - `keystore_password`, which should be replaced by `ssl_keystore_password`
  - `keystore_type`, which should be replaced by `ssl_keystore_password`
  - `truststore`, which should be replaced by `ssl_truststore_path>`
  - `truststore_password`, which should be replaced by `ssl_truststore_password`
  - `truststore_type`, which should be replaced by `ssl_truststore_type`


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Co-authored-by: Cas Donoghue <[email protected]>

Add ssl_enabled option (#146)

This commit added the `ssl_enabled` option by bumping the `logstash-mixin-http_client` to >= 7.4.0

Docs: Remove redundant table items (#142)

This commit removed the duplicated `ssl_verification_mode` item from the options table.

Standardize SSL settings (#141)

This commit standardizes the SSL settings by bumping the logstash-mixin-http_client version to >= 7.3.0, which:

- Adds standardized SSL settings and deprecates their non-standard counterparts. Deprecated settings will continue to work, and will provide pipeline maintainers with guidance toward using their standardized counterparts
- Adds new ssl_truststore_path, ssl_truststore_password, and ssl_truststore_type settings for configuring SSL-trust using a PKCS-12 or JKS trust store, deprecating their truststore, truststore_password, and truststore_type counterparts.
- Adds new ssl_certificate_authorities setting for configuring SSL-trust using a PEM-formatted list of certificate authorities, deprecating its cacert counterpart.
Adds new ssl_keystore_path, ssl_keystore_password, and ssl_keystore_type settings for configuring SSL-identity using a PKCS-12 or JKS key store, deprecating their keystore, keystore_password, and keystore_type counterparts.
- Adds new ssl_certificate and ssl_key settings for configuring SSL-identity using a PEM-formatted certificate/key pair, deprecating their client_cert and client_key counterparts.
- Adds the ssl_cipher_suites option

Refactor: start using scheduler mixin (#134)

+ remove EoTime initialization - now part of mixin

Fix: make sure plugin is closing the http client (#130)

Feat: added ssl_supported_protocols option (#133)

Deps: allow any scheduler version with plugin (#132)

Feat: support ssl_verification_mode option (#131)