- update to SeaMonkey 2.53.18.2
* Block set-cookie from multipart/x-mixed-replace with pref bug
1864385.
* Check if WorkerRunnable::Run runs on top of
WorkerThreadPrimaryRunnable::Run in a worker thread bug 1867982.
* Process pairs in coord list in PolyArea bug 1878211.
* Cherry-pick update to dav1d bug 1881093.
* Land NSS NSS_3_90_2_RTM UPGRADE_NSS_RELEASE bug 1880562.
* Fix DSN for send later bug 815638.
* Catch webNavigation error during tab restore bug 1885748.
* SeaMonkey 2.53.18.2 uses the same backend as Firefox and contains
the relevant Firefox 60.8 security fixes.
* SeaMonkey 2.53.18.2 shares most parts of the mail and news code
with Thunderbird. Please read the Thunderbird 60.8.0 release notes
for specific security fixes in this release.
* Additional important security fixes up to Current Firefox 115.9
and Thunderbird 115.9 ESR plus many enhancements have been
backported. We will continue to enhance SeaMonkey security in
subsequent 2.53.x beta and release versions as fast as we are able
to.
- request inclusion in Leap 15.5 and 15.6:
https://bugzilla.opensuse.org/show_bug.cgi?id=1222137

- Use %patch -P N instead of deprecated %patchN.

- Replace python-devel and python2-xml BuildRequires with
python3-base: the build log already contains
Creating Python 3 environment
i.e, python2 was not used anymore (boo#1219739).