go.mod: bump Pebble to 983d98b17ece

[jbowens]

Changes:

• 983d98b1 db: add TestWALFailoverRandomized
• 65b6ce16 wal: ensure last record.LogWriter is closed to avoid spurious errors on open
• 95565b7c vfs: workaround for a maps.Clone bug
• 34e929e1 sstable: clean up datadriven build commands
• 66373835 treeprinter: fix license
• 7b047cd6 db: refactor disk usage estimate using range annotations

Release note: none. Epic: none.

[cockroach-teamcity]

This change is 

[jbowens]

TFTR

bors r=nicktrav

[craig[bot]]

Build succeeded:

• macos_amd64_build
• acceptance
• check_generated_code
• macos_arm64_build
• windows_build
• examples_orms
• linux_arm64_build
• lint
• docker_image_amd64
• unit_tests
• linux_amd64_build
• linux_amd64_fips_build
• local_roachtest
• local_roachtest_fips