Bump third_party/cores/opentitan from `eec48c4` to `9aca637`

[dependabot[bot]]

Bumps third_party/cores/opentitan from eec48c4 to 9aca637.

Commits

• 9aca637 [dv] Increase stress tests run time limit to 3h
• 23aafbe [tests] Add mask ROM shutdown e2e tests to the test plan
• ffc6ec4 [entropy_src/dv] Scoreboarding of REPCNT & REPCNTS
• 0a2a301 [entropy_src/rtl] Shift repcnt HT sampling pulse
• 7cfb62c [entropy_src/rtl] Suppress watermarks after disable
• 9dc54e9 [flash_ctrl,dv] interrupt mode test
• aee408b [top] revert ast pok bypass
• 3424d46 [otbn,dv] Increase iteration of sw_errs_fatal_chk
• 90a839b [otbn,fcov] Fix fatal_error related sampling
• b38cff0 [otbn,dv] Use scoreboard to set CTRL=1 in ISS
• Additional commits viewable in compare view

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