Updated classic mode deprecation date to end 2026. Fixes #2001.

Signed-off-by: Eric D. Schabell <[email protected]>

Author: eschabell

administration/configuring-fluent-bit/README.md

@@ -3,7 +3,7 @@
 Fluent Bit supports two configuration formats:
 
 - [YAML](yaml/README.md): Standard configuration format as of v3.2.
-- [Classic mode](classic-mode/README.md): To be deprecated at the end of 2025.
+- [Classic mode](classic-mode/README.md): To be deprecated at the end of 2026.
 
 ## Command line interface
 
@@ -133,4 +133,4 @@ Outputs
   prometheus_exporter     Prometheus Exporter
   prometheus_remote_write Prometheus remote write
   s3                      Send to S3
-```
+```