gateway: bump serde_json from 1.0.115 to 1.0.120 in /gateway

[dependabot[bot]]

Bumps serde_json from 1.0.115 to 1.0.120.

Release notes

Sourced from serde_json's releases.

v1.0.120

• Correctly specify required version of indexmap dependency (#1152, thanks @​cforycki)

v1.0.119

• Add serde_json::Map::shift_insert (#1149, thanks @​joshka)

v1.0.118

• Implement Hash for serde_json::Value (#1127, thanks @​edwardycl)

v1.0.117

• Resolve unexpected_cfgs warning (#1130)

v1.0.116

• Make module structure comprehensible to static analysis (#1124, thanks @​mleonhard)

Commits

• bcedc3d Release 1.0.120
• 962c0fb Merge pull request #1152 from cforycki/fix/index-map-minimal-version
• 3480fed fix: indexmap minimal version with Map::shift_insert()
• b48b9a3 Release 1.0.119
• 8878cd7 Make shift_insert available for inlining like other Map methods
• 352b7ab Document the cfg required for Map::shift_insert to exist
• c17e63f Merge pull request #1149 from joshka/master
• 309ef6b Add Map::shift_insert()
• a9e089a Merge pull request #1146 from haouvw/master
• a83fe96 chore: remove repeat words
• Additional commits viewable in compare view

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