[jfx17u] RFR: 8280490: Change JavaFX release version in jfx17u to 17.0.3

[Kevin Rushforth]

Bump release version in `jfx17u` repo to 17.0.3 for the start of a new release.

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Commit messages:
 - 8280490: Change JavaFX release version in jfx17u to 17.0.3

Changes: https://git.openjdk.java.net/jfx17u/pull/29/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx17u&pr=29&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280490
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx17u/pull/29.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx17u pull/29/head:pull/29

PR: https://git.openjdk.java.net/jfx17u/pull/29