fix: influxdb float serialization error

[JimMoen]

Fixes EMQX-10509

Summary

🤖 Generated by Copilot at 4a7ba95

Fix a bug in emqx_bridge_influxdb_connector that caused serialization errors when writing integers as floats to the InfluxDB bridge. Add a changelog file fix-11223.en.md to document the bug fix.

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/{ce,ee}/(feat|perf|fix)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update

[coveralls]

Pull Request Test Coverage Report for Build 5507784632

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 20 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+0.04%) to 82.301%

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Files with Coverage Reduction	New Missed Lines	%
apps/emqx_conf/src/emqx_conf_schema.erl	1	94.74%
apps/emqx_gateway_mqttsn/src/emqx_mqttsn_channel.erl	1	73.69%
apps/emqx_gateway/src/emqx_gateway_utils.erl	1	85.81%
apps/emqx_resource/src/emqx_resource_buffer_worker.erl	2	93.26%
apps/emqx_gateway_exproto/src/emqx_exproto_gsvr.erl	3	67.27%
apps/emqx_gateway/src/emqx_gateway_cm.erl	3	77.88%
apps/emqx/src/emqx_reason_codes.erl	9	88.97%

Totals
Change from base Build 5506845904:	0.04%
Covered Lines:	30945
Relevant Lines:	37600

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💛 - Coveralls

[HJianBo]

LGTM