build(deps): bump third_party/ibex from `f30e84b` to `7e9eef2`

[dependabot[bot]]

Bumps third_party/ibex from f30e84b to 7e9eef2.

Commits

• 7e9eef2 [cosim] Pass PMP configuration through to spike
• 8282a0d [rtl] Fix MaxOutstandingDSideAccessesCorrect assertion
• 4acc27b [rtl, icache] Rework invalidation logic
• f2c09fe [ci] Move to spike-ibex-v0.4
• 3c1502c Add special-case signature for test_done in riscv_csr_test
• b8c6a34 Change test_done mechanism to use riscvdv handshake, not ecall
• e53a02a [rtl] Alter some CSR WARL behaviour to match spike
• 19d12ee [rtl] Fix MISA
• ae76c62 [dv,cosim] Add memory region to match UVM env
• 4975c7f [lint] Minor fixes
• Additional commits viewable in compare view

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