Bump indexmap from 2.5.0 to 2.6.0 #4932

Job	Run time
Build, rustfmt, and python lint	1m 46s
python3.8-x64 macOS-13	5m 5s
python3.8-x64 ubuntu-latest	2m 34s
python3.8-x64 windows-latest	4m 53s
python3.9-x64 macOS-13	4m 32s
python3.9-x64 ubuntu-latest	2m 28s
python3.9-x64 windows-latest	4m 49s
python3.10-x64 macOS-13	4m 41s
python3.10-arm64 macOS-14	2m 10s
python3.10-x64 ubuntu-latest	2m 30s
python3.10-x64 windows-latest	4m 46s
python3.11-x64 macOS-13	3m 46s
python3.11-arm64 macOS-14	2m 10s
python3.11-x64 ubuntu-latest	2m 28s
python3.11-x64 windows-latest	5m 38s
python3.12-x64 macOS-13	4m 29s
python3.12-arm64 macOS-14	2m 26s
python3.12-x64 ubuntu-latest	2m 56s
python3.12-x64 windows-latest	4m 47s
python3.8-x64 ubuntu-latest MSRV	2m 51s
python3.13-dev-x64 ubuntu-latest Beta	3m 4s
Build Docs	7m 29s
Coverage	2m 48s
python-stubs-3.8	2m 8s
python-stubs-3.9	2m 17s
python-stubs-3.10	2m 20s
python-stubs-3.11	2m 10s
	1h 34m 1s

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