Bump Spike and pk to latest commits

[TommyMurphyTM1234]

Bump Spike:

• From: https://github.com/riscv-software-src/riscv-isa-sim/commit/f7d0dba6012d49cb75b2f175a31a85cf4b2db3b3
• To: https://github.com/riscv-software-src/riscv-isa-sim/commit/88fc84ded155a9e01987c4dfb7a77800e69b232b

Bump pk:

• From: https://github.com/riscv-software-src/riscv-pk/commit/2efabd3e6604b8a9e8f70baf52f57696680c7855
• To: https://github.com/riscv-software-src/riscv-pk/commit/abadfdc507d5a75b6272dc360e70a80a510c758a

I ran the test suite for the (non-multilib) bare-metal/Newlib and Linux/glibc toolchains and they don't seem any more broken than before this change:

• https://github.com/riscv-collab/riscv-gnu-toolchain/issues/1579

Test logs:

• report-newlib.log.zip: report-newlib.log.zip
• report-linux.log.zip: report-linux.log.zip

[TommyMurphyTM1234]

Thanks @cmuellner. 👍