feat(26.04): cargo-1.88 slices

[lczyk]

Proposed changes

slices for cargo-1.88

this is the default cargo for 26.04

Related issues/PRs

this PR is part of the following stack:

• feat(26.04): rustc-1.88 slices  #801
  • feat(26.04): cargo-1.88 slices #834 (this PR)

Forward porting

the default rust versions for each of the current versions of Ubuntu are:

ubuntu	rustc	gcc
24.04	1.75	13
25.04	1.84	14
25.10	1.85	15
26.04	1.88	15

1.75:

• feat(24.04): cargo-1.75 slices #814

1.84:

• feat(25.04): cargo-1.84 slices #634 (EOL)

1.85:

• feat(24.04): cargo-1.85 slices #845
• feat(25.10): cargo-1.85 slices #830
• feat(26.04): cargo-1.85 slices #831

1.88:

• feat(25.10): cargo-1.88 slices #833
• feat(26.04): cargo-1.88 slices #834 (this PR)

Checklist

• I have read the contributing guidelines
• I have tested my changes (see how)
• I have already submitted the CLA form

🦀

[lczyk]

plagued by:

• ci: networking error preparing lxd in tests (1) #752
• ci: retry for chisel cut in install_slices helper #743

[github-actions]

Test Coverage

Average Total Coverage: 37.50%

---

Arch: aarch64

Coverage: 37.50%

cargo: 🌂 0.00% (4 missing)

cargo_cargo
cargo_copyright
cargo_headers
cargo_libs

cargo-1.88: 🌂 50.00% (2 missing)

cargo-1.88_headers
cargo-1.88_libs

libgit2-1.9: 🌂 50.00% (2 missing)

libgit2-1.9_cargo
libgit2-1.9_headers

libpam0g-dev: 🌂 50.00% (2 missing)

libpam0g-dev_cargo
libpam0g-dev_headers

---

Arch: x86_64

Coverage: 37.50%

cargo: 🌂 0.00% (4 missing)

cargo_cargo
cargo_copyright
cargo_headers
cargo_libs

cargo-1.88: 🌂 50.00% (2 missing)

cargo-1.88_headers
cargo-1.88_libs

libgit2-1.9: 🌂 50.00% (2 missing)

libgit2-1.9_cargo
libgit2-1.9_headers

libpam0g-dev: 🌂 50.00% (2 missing)

libpam0g-dev_cargo
libpam0g-dev_headers