RFR: 8369246: Use https in make/devkit scripts

[Mikael Vidstedt]

Let's switch to https for URLs in the make/devkit files, where possible.

That's most places, apart from - it turns out from empirical testing - the `fedora.riscv.rocks` (RISC-V) URL in Tools.gmk.

Testing:

* Built devkit on linux-x64
* Verified that the JDK builds with the new devkit

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Commit messages:
 - 8369246: Use https in make/devkit scripts

Changes: https://git.openjdk.org/jdk/pull/27663/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27663&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369246
  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/27663.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27663/head:pull/27663

PR: https://git.openjdk.org/jdk/pull/27663