Drop p8 and z13 support

Author: miladfarca

BUILDING.md

@@ -112,15 +112,15 @@ platforms. This is true regardless of entries in the table below.
 | GNU/Linux        | arm64            | kernel >= 4.18[^1], glibc >= 2.28 | Tier 1       | e.g. Ubuntu 20.04, Debian 10, RHEL 8 |
 | GNU/Linux        | armv7            | kernel >= 4.18[^1], glibc >= 2.28 | Experimental | Downgraded as of Node.js 24          |
 | GNU/Linux        | armv6            | kernel >= 4.14, glibc >= 2.24     | Experimental | Downgraded as of Node.js 12          |
-| GNU/Linux        | ppc64le >=power8 | kernel >= 4.18[^1], glibc >= 2.28 | Tier 2       | e.g. Ubuntu 20.04, RHEL 8            |
-| GNU/Linux        | s390x            | kernel >= 4.18[^1], glibc >= 2.28 | Tier 2       | e.g. RHEL 8                          |
+| GNU/Linux        | ppc64le >=power9 | kernel >= 4.18[^1], glibc >= 2.28 | Tier 2       | e.g. Ubuntu 20.04, RHEL 8            |
+| GNU/Linux        | s390x >=z14      | kernel >= 4.18[^1], glibc >= 2.28 | Tier 2       | e.g. RHEL 8                          |
 | GNU/Linux        | loong64          | kernel >= 5.19, glibc >= 2.36     | Experimental |                                      |
 | Windows          | x64              | >= Windows 10/Server 2016         | Tier 1       | [^2],[^3]                            |
 | Windows          | arm64            | >= Windows 10                     | Tier 2       |                                      |
 | macOS            | x64              | >= 13.5                           | Tier 1       | For notes about compilation see [^4] |
 | macOS            | arm64            | >= 13.5                           | Tier 1       |                                      |
 | SmartOS          | x64              | >= 18                             | Tier 2       |                                      |
-| AIX              | ppc64be >=power8 | >= 7.2 TL04                       | Tier 2       |                                      |
+| AIX              | ppc64be >=power9 | >= 7.2 TL04                       | Tier 2       |                                      |
 | FreeBSD          | x64              | >= 13.2                           | Experimental |                                      |
 | OpenHarmony      | arm64            | >= 5.0                            | Experimental |                                      |