ci(test): set saucelabs region to eu

[st3iny]

To fix CI. Apparently, the region has to be set explicitly since some time and the action is not pinned to a version.

[st3iny]

/backport to stable31

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 39.62%. Comparing base (800090d) to head (36450e5). :warning: Report is 61 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1600   +/-   ##
=========================================
  Coverage     39.62%   39.62%           
  Complexity      107      107           
=========================================
  Files            20       20           
  Lines           323      323           
=========================================
  Hits            128      128           
  Misses          195      195           

Flag	Coverage Δ
unittests	39.62% <ø> (ø)

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[ChristophWurst]

/backport to stable31

[ChristophWurst]

/backport to stable30

[ChristophWurst]

2025-04-04 15:43:38.357 [4428] [CLI] [info] FATAL: Sauce Connect Proxy region eu is not one of the supported regions: <eu-central, us-east, us-west>.

:grimacing:

[ChristophWurst]

2025-04-04 15:43:38.356 [4428] [CLI] [info] WARNING: ***** Important Notice: Sauce Connect 4 is reaching end-of-life > status ***** 2025-04-04 15:43:38.356 [4428] [CLI] [info] WARNING: Starting May 5, 2025, servers will no longer support Sauce Connect 4 traffic. 2025-04-04 15:43:38.356 [4428] [CLI] [info] WARNING: To avoid interruptions, please upgrade to Sauce Connect 5 at your earliest convenience. 2025-04-04 15:43:38.356 [4428] [CLI] [info] WARNING: Learn more: https://docs.saucelabs.com/secure-connections/sauce-connect-5/migrating/

the next thing to break

[st3iny]

God damn, their documentation mentions the eu shortcut. I'm gonna fix it ...

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