[jdk8u] RFR: 8295894: Remove SECOM certificate that is expiring in September 2023

[Severin Gehwolf]

Low risk backport of JDK-8295894 which removes an expired certificate from cacerts. It expires in September and we should get it into 8u392. Patch is a clean backport modulo usual path changes to adjust to the 8u layout.

It's also a dependency so that the backport of JDK-8314960 (Add certigna 2 root CA) applies clean.

Testing:
- [ ] GHA (still running)
- [x] `jdk/test/security/infra/java/security/cert/CertPathValidator` and  `jdk/test/sun/security/lib/cacerts`. Pass, except for `AmazonCA.java` which is being dealt with elsewhere: https://git.openjdk.org/jdk8u-dev/pull/364 and https://git.openjdk.org/jdk8u-dev/pull/365

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Commit messages:
 - Backport b40b1ca1f6ab606387bb1a466810f0e23dead560

Changes: https://git.openjdk.org/jdk8u/pull/48/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u&pr=48&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295894
  Stats: 33 lines in 2 files changed: 0 ins; 30 del; 3 mod
  Patch: https://git.openjdk.org/jdk8u/pull/48.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u.git pull/48/head:pull/48

PR: https://git.openjdk.org/jdk8u/pull/48