pkgconfig: Update to latest

Brings following change

  * d97db4f Update URL for bug reporting
  * eb866ad Spelling and grammar in pkg.m4
  * 1f81c80 Fix spelling of rra's name
  * 350515e Use https for developer.gnome.org URL
  * 834ecc2 Update bug reporting URL to point to gitlab
  * 38936b2 Call setlocale in main function
  * 2ad16fa pkg: Make ordering of output from print_package_list() deterministic
  * 2dd2b19 parse: Don't emit unknown keyword warning for Libs.private

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>