Add dates for Limited Maintenance & EOL for Airflow 2.x (#50794)

Discussion in https://lists.apache.org/thread/xsj7h4gyk51ktxt8z9xppckknojdq70v

(cherry picked from commit 0faa0cc)

Author: kaxil

README.md

@@ -300,7 +300,7 @@ Apache Airflow version life cycle:
 | Version   | Current Patch/Minor   | State     | First Release   | Limited Maintenance   | EOL/Terminated   |
 |-----------|-----------------------|-----------|-----------------|-----------------------|------------------|
 | 3         | 3.0.2                 | Supported | Apr 22, 2025    | TBD                   | TBD              |
-| 2         | 2.11.0                | Supported | Dec 17, 2020    | TBD                   | TBD              |
+| 2         | 2.11.0                | Supported | Dec 17, 2020    | Oct 22, 2025          | Apr 22, 2026     |
 | 1.10      | 1.10.15               | EOL       | Aug 27, 2018    | Dec 17, 2020          | June 17, 2021    |
 | 1.9       | 1.9.0                 | EOL       | Jan 03, 2018    | Aug 27, 2018          | Aug 27, 2018     |
 | 1.8       | 1.8.2                 | EOL       | Mar 19, 2017    | Jan 03, 2018          | Jan 03, 2018     |

airflow-core/docs/installation/supported-versions.rst

@@ -30,7 +30,7 @@ Apache Airflow® version life cycle:
 Version    Current Patch/Minor    State      First Release    Limited Maintenance    EOL/Terminated
 =========  =====================  =========  ===============  =====================  ================
 3          3.0.2                  Supported  Apr 22, 2025     TBD                    TBD
-2          2.11.0                 Supported  Dec 17, 2020     TBD                    TBD
+2          2.11.0                 Supported  Dec 17, 2020     Oct 22, 2025           Apr 22, 2026
 1.10       1.10.15                EOL        Aug 27, 2018     Dec 17, 2020           June 17, 2021
 1.9        1.9.0                  EOL        Jan 03, 2018     Aug 27, 2018           Aug 27, 2018
 1.8        1.8.2                  EOL        Mar 19, 2017     Jan 03, 2018           Jan 03, 2018

scripts/ci/pre_commit/supported_versions.py

@@ -35,7 +35,7 @@
 
 SUPPORTED_VERSIONS = (
     ("3", "3.0.2", "Supported", "Apr 22, 2025", "TBD", "TBD"),
-    ("2", "2.11.0", "Supported", "Dec 17, 2020", "TBD", "TBD"),
+    ("2", "2.11.0", "Supported", "Dec 17, 2020", "Oct 22, 2025", "Apr 22, 2026"),
     ("1.10", "1.10.15", "EOL", "Aug 27, 2018", "Dec 17, 2020", "June 17, 2021"),
     ("1.9", "1.9.0", "EOL", "Jan 03, 2018", "Aug 27, 2018", "Aug 27, 2018"),
     ("1.8", "1.8.2", "EOL", "Mar 19, 2017", "Jan 03, 2018", "Jan 03, 2018"),