Merge tag 'pull-request-2025-04-30' of https://gitlab.com/thuth/qemu into staging

* Extend s390x diagnose call 308 subcode 10 to return more information
* Make valgrind support configurable
* Drop support for Python 3.8
* Some other misc cosmetic changes

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# gpg: Signature made Wed 30 Apr 2025 14:48:36 EDT
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2025-04-30' of https://gitlab.com/thuth/qemu:
  docs/devel/build-environment: enhance MSYS2 instructions
  hw/rtc/mc146818rtc: Drop pre-v3 migration stream support
  meson.build: Put the D-Bus summary into the UI section
  tests/functional/test_ppc64_pseries: Skip test_ppc64_linux_smt_boot if necessary
  Drop support for Python 3.8
  meson/configure: add 'valgrind' option & --{en, dis}able-valgrind flag
  target/s390x: Return UVC cmd code, RC and RRC value when DIAG 308 Subcode 10 fails to enter secure mode
  target/s390x: Introduce function when exiting PV
  target/s390x: Introduce constant when checking if PV header couldn't be decrypted

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>