ci/coverage: Fix cargo-tarpaulin to its locked version #1813

Job	Run time
build-and-export-test-all-docker	0s
Check links	20s
Cross-compile Parsec to various targets	14m 41s
Integration tests using CryptoAuthentication Library provider	16m 15s
Various tests targeting a Parsec image with all providers included	39m 48s
Cargo check all-providers (current Rust stable & old compiler)	19m 45s
Check that the fuzz testing framework is still working	15m 58s
Integration tests using Mbed Crypto provider	17m 21s
OnDiskKIM E2E tests on all providers	47m 0s
Integration tests using PKCS 11 provider	20m 42s
Integration tests using TPM provider	27m 20s
Integration tests using Crypto Trusted Service provider	18m 26s
	3h 57m 36s

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