RFR: 2169 pr-bot should ignore case in "Backport <sha>" PR titles [v3]

[Ludvig Janiuk]

> There's no reason why this should validate case, and has caused unnecessary friction in the past.

Ludvig Janiuk has updated the pull request incrementally with one additional commit since the last revision:

  Tests

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1611/files
  - new: https://git.openjdk.org/skara/pull/1611/files/f6e0794b..9022ee2f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1611&range=02
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1611&range=01-02

  Stats: 67 lines in 1 file changed: 67 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1611.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1611/head:pull/1611

PR: https://git.openjdk.org/skara/pull/1611