misc: Fix reported clippy warnings · confidential-containers/td-shim@e197fdd

The following actions uses node12 which is deprecated and will be forced to run on node16: actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

for loop over an `Option`. This is more readably written as an `if let` statement

`td-loader-fuzz` (bin "elf") generated 1 warning

for loop over an `Option`. This is more readably written as an `if let` statement

`td-loader-fuzz` (bin "elf") generated 1 warning

for loop over an `Option`. This is more readably written as an `if let` statement

`td-loader-fuzz` (bin "elf") generated 1 warning

for loop over an `Option`. This is more readably written as an `if let` statement

`td-loader-fuzz` (bin "pe") generated 1 warning

for loop over an `Option`. This is more readably written as an `if let` statement

`td-loader-fuzz` (bin "pe") generated 1 warning

for loop over an `Option`. This is more readably written as an `if let` statement

`td-loader-fuzz` (bin "afl_elf") generated 1 warning

for loop over an `Option`. This is more readably written as an `if let` statement

`td-loader-fuzz` (bin "afl_pe") generated 1 warning

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

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