RFR: 8325055: Rename Injector.h

[Kim Barrett]

Please review this trivial change that renames the file
test/hotspot/jtreg/vmTestbase/nsk/share/jvmti/Injector.h to Injector.hpp.

Testing: mach5 tier1

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Commit messages:
 - rename Injector.h

Changes: https://git.openjdk.org/jdk/pull/17656/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17656&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325055
  Stats: 9 lines in 4 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/17656.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17656/head:pull/17656

PR: https://git.openjdk.org/jdk/pull/17656