Bump docker image used for rust build to 1.75 #1527

Job	Run time
Bazel	1m 20s
macOS	14m 0s
ASAN	6m 38s
Test Big Endian	9m 20s
UBSAN	6m 46s
Ubuntu 18.04 (Build: Debug, Compilers: gcc-6/g++-6, Shared Library: true)	10m 26s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	8m 59s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: true)	18m 57s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	9m 28s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: false)	19m 10s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: true)	15m 10s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: true)	9m 4s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: false)	15m 3s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: false)	10m 16s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	14m 8s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	14m 4s
	3h 2m 49s

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